diff --git a/frameworks/c/ability_runtime/BUILD.gn b/frameworks/c/ability_runtime/BUILD.gn
index 94f46fa9d2..a959d32ddf 100644
--- a/frameworks/c/ability_runtime/BUILD.gn
+++ b/frameworks/c/ability_runtime/BUILD.gn
@@ -88,6 +88,7 @@ ohos_shared_library("ability_runtime") {
     "ability_base:ability_base_want",
     "ability_base:want",
     "c_utils:utils",
+    "eventhandler:libeventhandler",
     "ffrt:libffrt",
     "hilog:libhilog",
     "image_framework:image_native",
diff --git a/frameworks/c/ability_runtime/src/modular_object_extension_context.cpp b/frameworks/c/ability_runtime/src/modular_object_extension_context.cpp
index c3d7eae8eb..690bb272cf 100644
--- a/frameworks/c/ability_runtime/src/modular_object_extension_context.cpp
+++ b/frameworks/c/ability_runtime/src/modular_object_extension_context.cpp
@@ -15,9 +15,13 @@
 
 #include "modular_object_extension_context.h"
 
+#include <memory>
+#include <new>
+
 #include "ability_business_error_utils.h"
 #include "ability_manager_client.h"
 #include "hilog_tag_wrapper.h"
+#include "ipc_error_code.h"
 #include "modular_object_extension_context_impl.h"
 #include "modular_object_extension_types.h"
 #include "start_options_impl.h"
@@ -29,6 +33,16 @@ using namespace OHOS::AAFwk;
 using namespace OHOS::AbilityRuntime;
 
 namespace {
+constexpr const char *REQUEST_TASK_NAME = "ModObjExtRequest";
+constexpr const char *DESTROY_TASK_NAME = "ModObjExtDestroy";
+
+struct IPCRemoteStubUserData {
+    std::weak_ptr<AppExecFwk::EventHandler> handler;
+    OH_OnRemoteRequestCallback requestCallback = nullptr;
+    OH_OnRemoteDestroyCallback destroyCallback = nullptr;
+    void *userData = nullptr;
+};
+
 AbilityRuntime_ErrorCode CheckMoeContext(OH_AbilityRuntime_ModObjExtensionContextHandle context,
     std::shared_ptr<OHOS::AbilityRuntime::Context> &contextPtr)
 {
@@ -62,6 +76,67 @@ AbilityRuntime_ErrorCode TransformWant(const AbilityBase_Want *want, Want &abili
     }
     return ABILITY_RUNTIME_ERROR_CODE_NO_ERROR;
 }
+
+std::unique_ptr<IPCRemoteStubUserData> CreateIPCRemoteStubUserData(
+    const std::shared_ptr<AppExecFwk::EventHandler> &handler,
+    OH_OnRemoteRequestCallback requestCallback, OH_OnRemoteDestroyCallback destroyCallback,
+    void *userData)
+{
+    std::unique_ptr<IPCRemoteStubUserData> callbackInfo(new (std::nothrow) IPCRemoteStubUserData());
+    if (callbackInfo == nullptr) {
+        return nullptr;
+    }
+    callbackInfo->handler = handler;
+    callbackInfo->requestCallback = requestCallback;
+    callbackInfo->destroyCallback = destroyCallback;
+    callbackInfo->userData = userData;
+    return callbackInfo;
+}
+
+int OnRemoteRequestOnHandler(uint32_t code, const OHIPCParcel *data, OHIPCParcel *reply, void *userData)
+{
+    auto *callbackInfo = static_cast<IPCRemoteStubUserData *>(userData);
+    if (callbackInfo == nullptr || callbackInfo->requestCallback == nullptr) {
+        return OH_IPC_INNER_ERROR;
+    }
+    auto handler = callbackInfo->handler.lock();
+    if (handler == nullptr) {
+        TAG_LOGE(AAFwkTag::APPKIT, "event handler not exist");
+        return OH_IPC_INNER_ERROR;
+    }
+    int32_t result = OH_IPC_INNER_ERROR;
+    auto task = [&callbackInfo, &result, code, data, reply]() {
+        result = callbackInfo->requestCallback(code, data, reply, callbackInfo->userData);
+    };
+    if (!handler->PostSyncTask(task, REQUEST_TASK_NAME)) {
+        TAG_LOGE(AAFwkTag::APPKIT, "post request task failed");
+        return OH_IPC_INNER_ERROR;
+    }
+    return result;
+}
+
+void OnRemoteDestroyOnHandler(void *userData)
+{
+    std::unique_ptr<IPCRemoteStubUserData> callbackInfo(static_cast<IPCRemoteStubUserData *>(userData));
+    if (callbackInfo == nullptr) {
+        return;
+    }
+    if (callbackInfo->destroyCallback == nullptr) {
+        return;
+    }
+    auto handler = callbackInfo->handler.lock();
+    if (handler == nullptr) {
+        TAG_LOGE(AAFwkTag::APPKIT, "event handler not exist");
+        return;
+    }
+    auto task = [&callbackInfo]() {
+        callbackInfo->destroyCallback(callbackInfo->userData);
+    };
+    if (!handler->PostSyncTask(task, DESTROY_TASK_NAME)) {
+        TAG_LOGE(AAFwkTag::APPKIT, "post destroy task failed");
+        return;
+    }
+}
 } // namespace
 
 #ifdef __cplusplus
@@ -138,6 +213,43 @@ AbilityRuntime_ErrorCode OH_AbilityRuntime_ModObjExtensionContext_TerminateSelf(
     return ConvertToCommonBusinessErrorCode(err);
 }
 
+OHIPCRemoteStub* OH_AbilityRuntime_ModObjExtensionContext_CreateIPCRemoteStub(
+    OH_AbilityRuntime_ModObjExtensionContextHandle context, const char *descriptor,
+    OH_OnRemoteRequestCallback requestCallback, OH_OnRemoteDestroyCallback destroyCallback, void *userData)
+{
+    if (descriptor == nullptr || requestCallback == nullptr) {
+        TAG_LOGE(AAFwkTag::APPKIT, "invalid create stub params");
+        return nullptr;
+    }
+    std::shared_ptr<OHOS::AbilityRuntime::Context> contextPtr;
+    auto ret = CheckMoeContext(context, contextPtr);
+    if (ret != ABILITY_RUNTIME_ERROR_CODE_NO_ERROR) {
+        return nullptr;
+    }
+    auto moeContext = std::static_pointer_cast<ModularObjectExtensionContext>(contextPtr);
+    auto callbackInfo = CreateIPCRemoteStubUserData(
+        moeContext->GetEventHandler(), requestCallback, destroyCallback, userData);
+    if (callbackInfo == nullptr) {
+        TAG_LOGE(AAFwkTag::APPKIT, "create callback info failed");
+        return nullptr;
+    }
+    auto *stub = OH_IPCRemoteStub_Create(descriptor, OnRemoteRequestOnHandler,
+        OnRemoteDestroyOnHandler, callbackInfo.get());
+    if (stub == nullptr) {
+        TAG_LOGE(AAFwkTag::APPKIT, "create remote stub failed");
+        return nullptr;
+    }
+    callbackInfo.release();
+    return stub;
+}
+
+void OH_AbilityRuntime_ModObjExtensionContext_DestroyIPCRemoteStub(
+    OH_AbilityRuntime_ModObjExtensionContextHandle context, OHIPCRemoteStub *stub)
+{
+    (void)context;
+    OH_IPCRemoteStub_Destroy(stub);
+}
+
 #ifdef __cplusplus
 } // extern "C"
 #endif
diff --git a/frameworks/native/ability/native/modular_object_extension/modular_object_extension.cpp b/frameworks/native/ability/native/modular_object_extension/modular_object_extension.cpp
index 13793c1e73..04cfc7eec6 100644
--- a/frameworks/native/ability/native/modular_object_extension/modular_object_extension.cpp
+++ b/frameworks/native/ability/native/modular_object_extension/modular_object_extension.cpp
@@ -17,6 +17,7 @@
 
 #include <new>
 
+#include "ability_handler.h"
 #include "hilog_tag_wrapper.h"
 #include "ipc_inner_object.h"
 #include "native_runtime.h"
@@ -53,6 +54,7 @@ void ModularObjectExtension::Init(const std::shared_ptr<AbilityLocalRecord> &rec
     moeContext_->type = AppExecFwk::ExtensionAbilityType::MODULAR_OBJECT;
     auto context = GetContext();
     if (context != nullptr) {
+        context->SetEventHandler(std::static_pointer_cast<AppExecFwk::EventHandler>(handler));
         moeContext_->context = context->weak_from_this();
     }
     moeInstance_->context = moeContext_;
diff --git a/frameworks/native/ability/native/modular_object_extension/modular_object_extension_context_impl.cpp b/frameworks/native/ability/native/modular_object_extension/modular_object_extension_context_impl.cpp
index d639a4b347..5d9b286247 100644
--- a/frameworks/native/ability/native/modular_object_extension/modular_object_extension_context_impl.cpp
+++ b/frameworks/native/ability/native/modular_object_extension/modular_object_extension_context_impl.cpp
@@ -24,6 +24,17 @@ namespace AbilityRuntime {
 const size_t ModularObjectExtensionContext::CONTEXT_TYPE_ID(
     std::hash<const char*> {} ("ModularObjectExtensionContext"));
 
+void ModularObjectExtensionContext::SetEventHandler(
+    const std::shared_ptr<AppExecFwk::EventHandler> &handler)
+{
+    handler_ = handler;
+}
+
+std::shared_ptr<AppExecFwk::EventHandler> ModularObjectExtensionContext::GetEventHandler() const
+{
+    return handler_.lock();
+}
+
 ErrCode ModularObjectExtensionContext::StartSelfUIAbility(const AAFwk::Want &want) const
 {
     HITRACE_METER_NAME(HITRACE_TAG_ABILITY_MANAGER, __PRETTY_FUNCTION__);
diff --git a/interfaces/kits/c/ability_runtime/modular_object_extension_context.h b/interfaces/kits/c/ability_runtime/modular_object_extension_context.h
index bd4f2ae372..897d16d8a2 100644
--- a/interfaces/kits/c/ability_runtime/modular_object_extension_context.h
+++ b/interfaces/kits/c/ability_runtime/modular_object_extension_context.h
@@ -157,6 +157,41 @@ AbilityRuntime_ErrorCode OH_AbilityRuntime_ModObjExtensionContext_StartSelfUIAbi
 AbilityRuntime_ErrorCode OH_AbilityRuntime_ModObjExtensionContext_TerminateSelf(
     OH_AbilityRuntime_ModObjExtensionContextHandle context);
 
+/**
+ * @brief Creates an <b>OHIPCRemoteStub</b> object with callbacks running on the extension's designated thread.
+ * The requestCallback and destroyCallback are invoked serially on the thread determined by the
+ * extension's {@link OH_AbilityRuntime_ThreadMode}. After calling
+ * {@link OH_AbilityRuntime_ModObjExtensionContext_DestroyIPCRemoteStub}, no new requestCallback
+ * invocations will occur, and any in-flight requestCallback will complete before destroyCallback is invoked.
+ *
+ * The caller is responsible for destroying the returned object by calling
+ * {@link OH_AbilityRuntime_ModObjExtensionContext_DestroyIPCRemoteStub} to avoid memory leaks.
+ *
+ * @param context Represents a pointer to a modular object extension ability context.
+ * @param descriptor Pointer to the descriptor of the <b>OHIPCRemoteStub</b> object to create. It cannot be NULL.
+ *                  The string is copied internally during creation, so the caller may release the descriptor
+ *                  after this function returns.
+ * @param requestCallback Callback used to process the data request. It cannot be NULL.
+ * @param destroyCallback Callback to be invoked when the object is destroyed. It can be NULL.
+ * @param userData Pointer to the user data. It can be NULL. Must remain valid before the object is destroyed.
+ * @return Returns the pointer to the <b>OHIPCRemoteStub</b> object created if the operation is successful;
+ * returns NULL otherwise.
+ * @since 26.0.0
+ */
+OHIPCRemoteStub* OH_AbilityRuntime_ModObjExtensionContext_CreateIPCRemoteStub(
+    OH_AbilityRuntime_ModObjExtensionContextHandle context, const char *descriptor,
+    OH_OnRemoteRequestCallback requestCallback, OH_OnRemoteDestroyCallback destroyCallback, void *userData);
+
+/**
+ * @brief Destroys an <b>OHIPCRemoteStub</b> object.
+ *
+ * @param context Represents a pointer to a modular object extension ability context.
+ * @param stub Pointer to the <b>OHIPCRemoteStub</b> object to destroy.
+ * @since 26.0.0
+ */
+void OH_AbilityRuntime_ModObjExtensionContext_DestroyIPCRemoteStub(
+    OH_AbilityRuntime_ModObjExtensionContextHandle context, OHIPCRemoteStub *stub);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/interfaces/kits/native/ability/native/modular_object_extension/modular_object_extension_context_impl.h b/interfaces/kits/native/ability/native/modular_object_extension/modular_object_extension_context_impl.h
index 9b53861c0e..baff3582db 100644
--- a/interfaces/kits/native/ability/native/modular_object_extension/modular_object_extension_context_impl.h
+++ b/interfaces/kits/native/ability/native/modular_object_extension/modular_object_extension_context_impl.h
@@ -16,6 +16,9 @@
 #ifndef OHOS_ABILITY_RUNTIME_MODULAR_OBJECT_EXTENSION_CONTEXT_IMPL_H
 #define OHOS_ABILITY_RUNTIME_MODULAR_OBJECT_EXTENSION_CONTEXT_IMPL_H
 
+#include <memory>
+
+#include "event_handler.h"
 #include "extension_context.h"
 #include "start_options.h"
 #include "want.h"
@@ -27,6 +30,10 @@ public:
     ModularObjectExtensionContext() = default;
     ~ModularObjectExtensionContext() override = default;
 
+    void SetEventHandler(const std::shared_ptr<AppExecFwk::EventHandler> &handler);
+
+    std::shared_ptr<AppExecFwk::EventHandler> GetEventHandler() const;
+
     ErrCode StartSelfUIAbility(const AAFwk::Want &want) const;
 
     ErrCode StartSelfUIAbilityWithStartOptions(const AAFwk::Want &want, const AAFwk::StartOptions &startOptions) const;
@@ -40,6 +47,9 @@ protected:
     {
         return contextTypeId == CONTEXT_TYPE_ID || ExtensionContext::IsContext(contextTypeId);
     }
+
+private:
+    std::weak_ptr<AppExecFwk::EventHandler> handler_;
 };
 } // namespace AbilityRuntime
 } // namespace OHOS
diff --git a/test/unittest/BUILD.gn b/test/unittest/BUILD.gn
index 614e8824e6..c4339930f1 100644
--- a/test/unittest/BUILD.gn
+++ b/test/unittest/BUILD.gn
@@ -352,6 +352,7 @@ group("unittest") {
       "modular_object_ability_connection_test:unittest",
       "modular_object_extension_context_capi_test:unittest",
       "modular_object_extension_test:unittest",
+      "modular_object_extension_context_impl_event_handler_test:unittest",
       "modular_object_extension_context_impl_test:unittest",
       "data_ability_manager_test:unittest",
       "data_ability_observer_proxy_test:unittest",
diff --git a/test/unittest/modular_object_extension_context_capi_test/mock/include/ipc_cparcel.h b/test/unittest/modular_object_extension_context_capi_test/mock/include/ipc_cparcel.h
index f2220d18c0..d99a427425 100644
--- a/test/unittest/modular_object_extension_context_capi_test/mock/include/ipc_cparcel.h
+++ b/test/unittest/modular_object_extension_context_capi_test/mock/include/ipc_cparcel.h
@@ -16,6 +16,10 @@
 #ifndef MOCK_IPC_CPARCEL_H
 #define MOCK_IPC_CPARCEL_H
 
+struct OHIPCParcel {
+    int dummy;
+};
+
 struct OHIPCRemoteStub {
     int dummy;
 };
diff --git a/test/unittest/modular_object_extension_context_capi_test/mock/include/ipc_cremote_object.h b/test/unittest/modular_object_extension_context_capi_test/mock/include/ipc_cremote_object.h
new file mode 100644
index 0000000000..15a9b46e39
--- /dev/null
+++ b/test/unittest/modular_object_extension_context_capi_test/mock/include/ipc_cremote_object.h
@@ -0,0 +1,39 @@
+/*
+ * Copyright (c) 2026 Huawei Device Co., Ltd.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef MOCK_IPC_CREMOTE_OBJECT_H
+#define MOCK_IPC_CREMOTE_OBJECT_H
+
+#include <cstdint>
+
+#include "ipc_cparcel.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef int (*OH_OnRemoteRequestCallback)(uint32_t code, const OHIPCParcel *data,
+    OHIPCParcel *reply, void *userData);
+typedef void (*OH_OnRemoteDestroyCallback)(void *userData);
+
+OHIPCRemoteStub* OH_IPCRemoteStub_Create(const char *descriptor, OH_OnRemoteRequestCallback requestCallback,
+    OH_OnRemoteDestroyCallback destroyCallback, void *userData);
+void OH_IPCRemoteStub_Destroy(OHIPCRemoteStub *stub);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // MOCK_IPC_CREMOTE_OBJECT_H
\ No newline at end of file
diff --git a/test/unittest/modular_object_extension_context_capi_test/mock/include/ipc_error_code.h b/test/unittest/modular_object_extension_context_capi_test/mock/include/ipc_error_code.h
new file mode 100644
index 0000000000..0b4e1359dd
--- /dev/null
+++ b/test/unittest/modular_object_extension_context_capi_test/mock/include/ipc_error_code.h
@@ -0,0 +1,21 @@
+/*
+ * Copyright (c) 2026 Huawei Device Co., Ltd.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef MOCK_IPC_ERROR_CODE_H
+#define MOCK_IPC_ERROR_CODE_H
+
+constexpr int OH_IPC_INNER_ERROR = -1;
+
+#endif // MOCK_IPC_ERROR_CODE_H
\ No newline at end of file
diff --git a/test/unittest/modular_object_extension_context_capi_test/mock/include/mock_types.h b/test/unittest/modular_object_extension_context_capi_test/mock/include/mock_types.h
index 7e2fc0f38e..71985cad4b 100644
--- a/test/unittest/modular_object_extension_context_capi_test/mock/include/mock_types.h
+++ b/test/unittest/modular_object_extension_context_capi_test/mock/include/mock_types.h
@@ -16,11 +16,29 @@
 #ifndef MOCK_TYPES_H
 #define MOCK_TYPES_H
 
+#include <functional>
+#include <memory>
+
 namespace OHOS {
 namespace AAFwk {
 class Want {};
 class StartOptions {};
 } // namespace AAFwk
+
+namespace AppExecFwk {
+class EventHandler {
+public:
+    bool PostSyncTask(const std::function<void()> &task, const char *name)
+    {
+        (void)name;
+        if (!task) {
+            return false;
+        }
+        task();
+        return true;
+    }
+};
+} // namespace AppExecFwk
 } // namespace OHOS
 
 #endif // MOCK_TYPES_H
diff --git a/test/unittest/modular_object_extension_context_capi_test/mock/include/modular_object_extension_context.h b/test/unittest/modular_object_extension_context_capi_test/mock/include/modular_object_extension_context.h
index 97bfcd5aac..978368bb54 100644
--- a/test/unittest/modular_object_extension_context_capi_test/mock/include/modular_object_extension_context.h
+++ b/test/unittest/modular_object_extension_context_capi_test/mock/include/modular_object_extension_context.h
@@ -17,6 +17,7 @@
 #define MOCK_MODULAR_OBJECT_EXTENSION_CONTEXT_H
 
 #include "ability_runtime_common.h"
+#include "ipc_cremote_object.h"
 
 struct AbilityBase_Want;
 typedef struct AbilityBase_Want AbilityBase_Want;
@@ -42,6 +43,13 @@ AbilityRuntime_ErrorCode OH_AbilityRuntime_ModObjExtensionContext_StartSelfUIAbi
 AbilityRuntime_ErrorCode OH_AbilityRuntime_ModObjExtensionContext_TerminateSelf(
     OH_AbilityRuntime_ModObjExtensionContextHandle context);
 
+OHIPCRemoteStub* OH_AbilityRuntime_ModObjExtensionContext_CreateIPCRemoteStub(
+    OH_AbilityRuntime_ModObjExtensionContextHandle context, const char *descriptor,
+    OH_OnRemoteRequestCallback requestCallback, OH_OnRemoteDestroyCallback destroyCallback, void *userData);
+
+void OH_AbilityRuntime_ModObjExtensionContext_DestroyIPCRemoteStub(
+    OH_AbilityRuntime_ModObjExtensionContextHandle context, OHIPCRemoteStub *stub);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/test/unittest/modular_object_extension_context_capi_test/mock/include/modular_object_extension_context_impl.h b/test/unittest/modular_object_extension_context_capi_test/mock/include/modular_object_extension_context_impl.h
index e7afb09e60..b0a7c63027 100644
--- a/test/unittest/modular_object_extension_context_capi_test/mock/include/modular_object_extension_context_impl.h
+++ b/test/unittest/modular_object_extension_context_capi_test/mock/include/modular_object_extension_context_impl.h
@@ -29,6 +29,12 @@ public:
     static ErrCode g_startSelfWithOptionsResult;
     static ErrCode g_terminateResult;
 
+    std::shared_ptr<OHOS::AppExecFwk::EventHandler> GetEventHandler() const
+    {
+        static auto handler = std::make_shared<OHOS::AppExecFwk::EventHandler>();
+        return handler;
+    }
+
     ErrCode StartSelfUIAbility(const AAFwk::Want &want) const { return g_startSelfResult; }
     ErrCode StartSelfUIAbilityWithStartOptions(const AAFwk::Want &want,
         const AAFwk::StartOptions &options) const { return g_startSelfWithOptionsResult; }
diff --git a/test/unittest/modular_object_extension_context_capi_test/modular_object_extension_context_capi_test.cpp b/test/unittest/modular_object_extension_context_capi_test/modular_object_extension_context_capi_test.cpp
index 6d686834ab..7ee0fc3545 100644
--- a/test/unittest/modular_object_extension_context_capi_test/modular_object_extension_context_capi_test.cpp
+++ b/test/unittest/modular_object_extension_context_capi_test/modular_object_extension_context_capi_test.cpp
@@ -15,6 +15,8 @@
 
 #include <gtest/gtest.h>
 
+#include <cstring>
+
 #include "modular_object_extension_context.h"
 #include "modular_object_extension_types.h"
 #include "modular_object_extension_context_impl.h"
@@ -37,6 +39,33 @@ ErrCode ModularObjectExtensionContext::g_terminateResult = ERR_OK;
 int OHOS::AAFwk::CWantManager::g_transformResult = 0;
 AbilityRuntime_ErrorCode g_checkWantResult = ABILITY_RUNTIME_ERROR_CODE_NO_ERROR;
 
+namespace {
+bool g_remoteStubCreateSuccess = true;
+int g_remoteStubDestroyCount = 0;
+OHIPCRemoteStub *g_lastDestroyedStub = nullptr;
+const char *g_lastCreateDescriptor = nullptr;
+OH_OnRemoteRequestCallback g_lastRequestCallback = nullptr;
+OH_OnRemoteDestroyCallback g_lastDestroyCallback = nullptr;
+void *g_lastRemoteStubUserData = nullptr;
+OHIPCRemoteStub g_mockRemoteStub {};
+} // namespace
+
+extern "C" OHIPCRemoteStub* OH_IPCRemoteStub_Create(const char *descriptor,
+    OH_OnRemoteRequestCallback requestCallback, OH_OnRemoteDestroyCallback destroyCallback, void *userData)
+{
+    g_lastCreateDescriptor = descriptor;
+    g_lastRequestCallback = requestCallback;
+    g_lastDestroyCallback = destroyCallback;
+    g_lastRemoteStubUserData = userData;
+    return g_remoteStubCreateSuccess ? &g_mockRemoteStub : nullptr;
+}
+
+extern "C" void OH_IPCRemoteStub_Destroy(OHIPCRemoteStub *stub)
+{
+    g_lastDestroyedStub = stub;
+    ++g_remoteStubDestroyCount;
+}
+
 AbilityRuntime_ErrorCode CheckWant(AbilityBase_Want *want)
 {
     return g_checkWantResult;
@@ -53,10 +82,33 @@ public:
         OHOS::AbilityRuntime::ModularObjectExtensionContext::g_terminateResult = ERR_OK;
         OHOS::AAFwk::CWantManager::g_transformResult = 0;
         g_checkWantResult = ABILITY_RUNTIME_ERROR_CODE_NO_ERROR;
+        g_remoteStubCreateSuccess = true;
+        g_remoteStubDestroyCount = 0;
+        g_lastDestroyedStub = nullptr;
+        g_lastCreateDescriptor = nullptr;
+        g_lastRequestCallback = nullptr;
+        g_lastDestroyCallback = nullptr;
+        g_lastRemoteStubUserData = nullptr;
     }
     void TearDown() override {}
 };
 
+namespace {
+int MockRemoteRequest(uint32_t code, const OHIPCParcel *data, OHIPCParcel *reply, void *userData)
+{
+    (void)code;
+    (void)data;
+    (void)reply;
+    (void)userData;
+    return 0;
+}
+
+void MockRemoteDestroy(void *userData)
+{
+    (void)userData;
+}
+} // namespace
+
 // ==================== GetBaseContext ====================
 
 HWTEST_F(ModularObjectExtensionContextCapiTest, GetBaseContext_NullContext_001, TestSize.Level1)
@@ -326,3 +378,120 @@ HWTEST_F(ModularObjectExtensionContextCapiTest, TerminateSelf_Error_001, TestSiz
     EXPECT_EQ(ret, ABILITY_RUNTIME_ERROR_CODE_INTERNAL);
     GTEST_LOG_(INFO) << "TerminateSelf_Error_001 end";
 }
+
+// ==================== CreateIPCRemoteStub ====================
+
+HWTEST_F(ModularObjectExtensionContextCapiTest, CreateIPCRemoteStub_NullDescriptor_001, TestSize.Level1)
+{
+    GTEST_LOG_(INFO) << "CreateIPCRemoteStub_NullDescriptor_001 start";
+    auto stub = OH_AbilityRuntime_ModObjExtensionContext_CreateIPCRemoteStub(
+        nullptr, nullptr, MockRemoteRequest, MockRemoteDestroy, nullptr);
+    EXPECT_EQ(stub, nullptr);
+    GTEST_LOG_(INFO) << "CreateIPCRemoteStub_NullDescriptor_001 end";
+}
+
+HWTEST_F(ModularObjectExtensionContextCapiTest, CreateIPCRemoteStub_NullRequestCallback_001, TestSize.Level1)
+{
+    GTEST_LOG_(INFO) << "CreateIPCRemoteStub_NullRequestCallback_001 start";
+    auto stub = OH_AbilityRuntime_ModObjExtensionContext_CreateIPCRemoteStub(
+        nullptr, "descriptor", nullptr, MockRemoteDestroy, nullptr);
+    EXPECT_EQ(stub, nullptr);
+    GTEST_LOG_(INFO) << "CreateIPCRemoteStub_NullRequestCallback_001 end";
+}
+
+HWTEST_F(ModularObjectExtensionContextCapiTest, CreateIPCRemoteStub_WrongType_001, TestSize.Level1)
+{
+    GTEST_LOG_(INFO) << "CreateIPCRemoteStub_WrongType_001 start";
+    auto ctx = std::make_shared<OH_AbilityRuntime_ModularObjectExtensionContext>();
+    ctx->type = OHOS::AppExecFwk::ExtensionAbilityType::SERVICE;
+    auto cppCtx = std::make_shared<OHOS::AbilityRuntime::ModularObjectExtensionContext>();
+    ctx->context = cppCtx;
+    auto stub = OH_AbilityRuntime_ModObjExtensionContext_CreateIPCRemoteStub(
+        ctx.get(), "descriptor", MockRemoteRequest, MockRemoteDestroy, nullptr);
+    EXPECT_EQ(stub, nullptr);
+    GTEST_LOG_(INFO) << "CreateIPCRemoteStub_WrongType_001 end";
+}
+
+HWTEST_F(ModularObjectExtensionContextCapiTest, CreateIPCRemoteStub_ExpiredContext_001, TestSize.Level1)
+{
+    GTEST_LOG_(INFO) << "CreateIPCRemoteStub_ExpiredContext_001 start";
+    auto ctx = std::make_shared<OH_AbilityRuntime_ModularObjectExtensionContext>();
+    ctx->type = OHOS::AppExecFwk::ExtensionAbilityType::MODULAR_OBJECT;
+    auto stub = OH_AbilityRuntime_ModObjExtensionContext_CreateIPCRemoteStub(
+        ctx.get(), "descriptor", MockRemoteRequest, MockRemoteDestroy, nullptr);
+    EXPECT_EQ(stub, nullptr);
+    GTEST_LOG_(INFO) << "CreateIPCRemoteStub_ExpiredContext_001 end";
+}
+
+HWTEST_F(ModularObjectExtensionContextCapiTest, CreateIPCRemoteStub_CreateFail_001, TestSize.Level1)
+{
+    GTEST_LOG_(INFO) << "CreateIPCRemoteStub_CreateFail_001 start";
+    auto ctx = std::make_shared<OH_AbilityRuntime_ModularObjectExtensionContext>();
+    ctx->type = OHOS::AppExecFwk::ExtensionAbilityType::MODULAR_OBJECT;
+    auto cppCtx = std::make_shared<OHOS::AbilityRuntime::ModularObjectExtensionContext>();
+    ctx->context = cppCtx;
+    g_remoteStubCreateSuccess = false;
+    auto stub = OH_AbilityRuntime_ModObjExtensionContext_CreateIPCRemoteStub(
+        ctx.get(), "descriptor", MockRemoteRequest, MockRemoteDestroy, nullptr);
+    EXPECT_EQ(stub, nullptr);
+    EXPECT_STREQ(g_lastCreateDescriptor, "descriptor");
+    EXPECT_NE(g_lastRequestCallback, nullptr);
+    EXPECT_NE(g_lastDestroyCallback, nullptr);
+    EXPECT_NE(g_lastRemoteStubUserData, nullptr);
+    GTEST_LOG_(INFO) << "CreateIPCRemoteStub_CreateFail_001 end";
+}
+
+HWTEST_F(ModularObjectExtensionContextCapiTest, CreateIPCRemoteStub_Success_001, TestSize.Level1)
+{
+    GTEST_LOG_(INFO) << "CreateIPCRemoteStub_Success_001 start";
+    int userData = 42;
+    auto ctx = std::make_shared<OH_AbilityRuntime_ModularObjectExtensionContext>();
+    ctx->type = OHOS::AppExecFwk::ExtensionAbilityType::MODULAR_OBJECT;
+    auto cppCtx = std::make_shared<OHOS::AbilityRuntime::ModularObjectExtensionContext>();
+    ctx->context = cppCtx;
+    auto stub = OH_AbilityRuntime_ModObjExtensionContext_CreateIPCRemoteStub(
+        ctx.get(), "descriptor", MockRemoteRequest, MockRemoteDestroy, &userData);
+    EXPECT_EQ(stub, &g_mockRemoteStub);
+    EXPECT_STREQ(g_lastCreateDescriptor, "descriptor");
+    EXPECT_NE(g_lastRequestCallback, nullptr);
+    EXPECT_NE(g_lastDestroyCallback, nullptr);
+    EXPECT_NE(g_lastRemoteStubUserData, nullptr);
+    GTEST_LOG_(INFO) << "CreateIPCRemoteStub_Success_001 end";
+}
+
+// ==================== DestroyIPCRemoteStub ====================
+
+HWTEST_F(ModularObjectExtensionContextCapiTest, DestroyIPCRemoteStub_NullStub_001, TestSize.Level1)
+{
+    GTEST_LOG_(INFO) << "DestroyIPCRemoteStub_NullStub_001 start";
+    OH_AbilityRuntime_ModObjExtensionContext_DestroyIPCRemoteStub(nullptr, nullptr);
+    EXPECT_EQ(g_remoteStubDestroyCount, 1);
+    EXPECT_EQ(g_lastDestroyedStub, nullptr);
+    GTEST_LOG_(INFO) << "DestroyIPCRemoteStub_NullStub_001 end";
+}
+
+HWTEST_F(ModularObjectExtensionContextCapiTest, DestroyIPCRemoteStub_Success_001, TestSize.Level1)
+{
+    GTEST_LOG_(INFO) << "DestroyIPCRemoteStub_Success_001 start";
+    OHIPCRemoteStub stub {};
+    OH_AbilityRuntime_ModObjExtensionContext_DestroyIPCRemoteStub(nullptr, &stub);
+    EXPECT_EQ(g_remoteStubDestroyCount, 1);
+    EXPECT_EQ(g_lastDestroyedStub, &stub);
+    GTEST_LOG_(INFO) << "DestroyIPCRemoteStub_Success_001 end";
+}
+
+HWTEST_F(ModularObjectExtensionContextCapiTest, DestroyIPCRemoteStub_ContextAndStubNotNull_001, TestSize.Level1)
+{
+    GTEST_LOG_(INFO) << "DestroyIPCRemoteStub_ContextAndStubNotNull_001 start";
+    auto ctx = std::make_shared<OH_AbilityRuntime_ModularObjectExtensionContext>();
+    ctx->type = OHOS::AppExecFwk::ExtensionAbilityType::MODULAR_OBJECT;
+    auto cppCtx = std::make_shared<OHOS::AbilityRuntime::ModularObjectExtensionContext>();
+    ctx->context = cppCtx;
+    OHIPCRemoteStub stub {};
+
+    OH_AbilityRuntime_ModObjExtensionContext_DestroyIPCRemoteStub(ctx.get(), &stub);
+
+    EXPECT_EQ(g_remoteStubDestroyCount, 1);
+    EXPECT_EQ(g_lastDestroyedStub, &stub);
+    GTEST_LOG_(INFO) << "DestroyIPCRemoteStub_ContextAndStubNotNull_001 end";
+}
diff --git a/test/unittest/modular_object_extension_context_impl_event_handler_test/BUILD.gn b/test/unittest/modular_object_extension_context_impl_event_handler_test/BUILD.gn
new file mode 100644
index 0000000000..8c32a276ae
--- /dev/null
+++ b/test/unittest/modular_object_extension_context_impl_event_handler_test/BUILD.gn
@@ -0,0 +1,45 @@
+# Copyright (c) 2026 Huawei Device Co., Ltd.
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import("//build/ohos.gni")
+import("//build/test.gni")
+import("//foundation/ability/ability_runtime/ability_runtime.gni")
+
+ohos_unittest("modular_object_extension_context_impl_event_handler_test") {
+  module_out_path = "ability_runtime/ability_runtime/modular_object_extension_context_impl_event_handler_test"
+  sanitize = {
+    cfi = true
+    cfi_cross_dso = true
+    debug = false
+    blocklist = "../../cfi_blocklist.txt"
+  }
+  sources = [
+    "modular_object_extension_context_impl_event_handler_test.cpp",
+    "${ability_runtime_path}/frameworks/native/ability/native/modular_object_extension/modular_object_extension_context_impl.cpp",
+  ]
+  include_dirs = [
+    "mock/include",
+  ]
+  external_deps = [
+    "c_utils:utils",
+    "googletest:gtest_main",
+    "hilog:libhilog",
+    "hitrace:hitrace_meter",
+    "ipc:ipc_core",
+  ]
+}
+
+group("unittest") {
+  testonly = true
+  deps = [ ":modular_object_extension_context_impl_event_handler_test" ]
+}
diff --git a/test/unittest/modular_object_extension_context_impl_event_handler_test/mock/include/ability_manager_client.h b/test/unittest/modular_object_extension_context_impl_event_handler_test/mock/include/ability_manager_client.h
new file mode 100644
index 0000000000..84b78cbc51
--- /dev/null
+++ b/test/unittest/modular_object_extension_context_impl_event_handler_test/mock/include/ability_manager_client.h
@@ -0,0 +1,19 @@
+/*
+ * Copyright (c) 2026 Huawei Device Co., Ltd.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef MOCK_ABILITY_MANAGER_CLIENT_H
+#define MOCK_ABILITY_MANAGER_CLIENT_H
+
+#endif // MOCK_ABILITY_MANAGER_CLIENT_H
diff --git a/test/unittest/modular_object_extension_context_impl_event_handler_test/mock/include/errors.h b/test/unittest/modular_object_extension_context_impl_event_handler_test/mock/include/errors.h
new file mode 100644
index 0000000000..e8e1ec698d
--- /dev/null
+++ b/test/unittest/modular_object_extension_context_impl_event_handler_test/mock/include/errors.h
@@ -0,0 +1,23 @@
+/*
+ * Copyright (c) 2026 Huawei Device Co., Ltd.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef MOCK_ERRORS_H
+#define MOCK_ERRORS_H
+
+#include <cstdint>
+using ErrCode = int32_t;
+constexpr ErrCode ERR_OK = 0;
+
+#endif // MOCK_ERRORS_H
diff --git a/test/unittest/modular_object_extension_context_impl_event_handler_test/mock/include/extension_context.h b/test/unittest/modular_object_extension_context_impl_event_handler_test/mock/include/extension_context.h
new file mode 100644
index 0000000000..99c299e09a
--- /dev/null
+++ b/test/unittest/modular_object_extension_context_impl_event_handler_test/mock/include/extension_context.h
@@ -0,0 +1,112 @@
+/*
+ * Copyright (c) 2026 Huawei Device Co., Ltd.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef MOCK_EXTENSION_CONTEXT_H
+#define MOCK_EXTENSION_CONTEXT_H
+
+#include <memory>
+#include "iremote_broker.h"
+#include "refbase.h"
+#include "iremote_object.h"
+#include "errors.h"
+
+namespace OHOS {
+namespace AbilityRuntime {
+
+class Context : public std::enable_shared_from_this<Context> {
+public:
+    Context() = default;
+    virtual ~Context() = default;
+};
+
+} // namespace AbilityRuntime
+
+namespace AppExecFwk {
+class EventHandler : public std::enable_shared_from_this<EventHandler> {
+public:
+    virtual ~EventHandler() = default;
+};
+} // namespace AppExecFwk
+
+namespace AAFwk {
+class Want {};
+
+class StartOptions {};
+
+class AbilityManagerClient {
+public:
+    static std::shared_ptr<AbilityManagerClient> GetInstance()
+    {
+        static auto instance = std::make_shared<AbilityManagerClient>();
+        return instance;
+    }
+
+    ErrCode StartSelfUIAbility(const Want &want)
+    {
+        return g_startSelfUIAbilityResult;
+    }
+
+    ErrCode StartSelfUIAbilityWithToken(const Want &want, const sptr<IRemoteObject> &token)
+    {
+        return g_startSelfUIAbilityResult;
+    }
+
+    ErrCode StartSelfUIAbilityWithStartOptions(const Want &want, const StartOptions &options)
+    {
+        return g_startSelfUIAbilityWithStartOptionsResult;
+    }
+
+    ErrCode StartSelfUIAbilityWithStartOptionsAndToken(
+        const Want &want, const StartOptions &options, const sptr<IRemoteObject> &token)
+    {
+        return g_startSelfUIAbilityWithStartOptionsResult;
+    }
+
+    ErrCode TerminateAbility(const sptr<IRemoteObject> &token, int32_t resultCode, const Want *resultWant)
+    {
+        g_terminateCalled = true;
+        g_lastToken = token.GetRefPtr();
+        return g_terminateResult;
+    }
+
+    static ErrCode g_startSelfUIAbilityResult;
+    static ErrCode g_startSelfUIAbilityWithStartOptionsResult;
+    static ErrCode g_terminateResult;
+    static bool g_terminateCalled;
+    static IRemoteObject *g_lastToken;
+
+    static void Reset()
+    {
+        g_startSelfUIAbilityResult = ERR_OK;
+        g_startSelfUIAbilityWithStartOptionsResult = ERR_OK;
+        g_terminateResult = ERR_OK;
+        g_terminateCalled = false;
+        g_lastToken = nullptr;
+    }
+};
+
+} // namespace AAFwk
+
+namespace AbilityRuntime {
+
+class ExtensionContext : public Context {
+public:
+    sptr<IRemoteObject> token_;
+};
+
+} // namespace AbilityRuntime
+} // namespace OHOS
+
+#endif // MOCK_EXTENSION_CONTEXT_H
diff --git a/test/unittest/modular_object_extension_context_impl_event_handler_test/mock/include/hilog_tag_wrapper.h b/test/unittest/modular_object_extension_context_impl_event_handler_test/mock/include/hilog_tag_wrapper.h
new file mode 100644
index 0000000000..f4178e3fba
--- /dev/null
+++ b/test/unittest/modular_object_extension_context_impl_event_handler_test/mock/include/hilog_tag_wrapper.h
@@ -0,0 +1,33 @@
+/*
+ * Copyright (c) 2025 Huawei Device Co., Ltd.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef OHOS_AAFWK_HILOG_TAG_WRAPPER_H
+#define OHOS_AAFWK_HILOG_TAG_WRAPPER_H
+
+namespace OHOS::AAFwk {
+enum class AAFwkLogTag : uint32_t {
+    DEFAULT = 0xD001300,
+};
+}
+
+using AAFwkTag = OHOS::AAFwk::AAFwkLogTag;
+
+#define TAG_LOGD(tag, fmt, ...) ((void)0)
+#define TAG_LOGI(tag, fmt, ...) ((void)0)
+#define TAG_LOGW(tag, fmt, ...) ((void)0)
+#define TAG_LOGE(tag, fmt, ...) ((void)0)
+#define TAG_LOGF(tag, fmt, ...) ((void)0)
+
+#endif
diff --git a/test/unittest/modular_object_extension_context_impl_event_handler_test/mock/include/hitrace_meter.h b/test/unittest/modular_object_extension_context_impl_event_handler_test/mock/include/hitrace_meter.h
new file mode 100644
index 0000000000..0a3347899b
--- /dev/null
+++ b/test/unittest/modular_object_extension_context_impl_event_handler_test/mock/include/hitrace_meter.h
@@ -0,0 +1,22 @@
+/*
+ * Copyright (c) 2026 Huawei Device Co., Ltd.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef MOCK_HITRACE_METER_H
+#define MOCK_HITRACE_METER_H
+
+#define HITRACE_METER_NAME(tag, name)
+#define HITRACE_TAG_ABILITY_MANAGER 0
+
+#endif // MOCK_HITRACE_METER_H
diff --git a/test/unittest/modular_object_extension_context_impl_event_handler_test/mock/include/modular_object_extension_context_impl.h b/test/unittest/modular_object_extension_context_impl_event_handler_test/mock/include/modular_object_extension_context_impl.h
new file mode 100644
index 0000000000..ad0926e0fa
--- /dev/null
+++ b/test/unittest/modular_object_extension_context_impl_event_handler_test/mock/include/modular_object_extension_context_impl.h
@@ -0,0 +1,53 @@
+/*
+ * Copyright (c) 2026 Huawei Device Co., Ltd.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef MOCK_MODULAR_OBJECT_EXTENSION_CONTEXT_IMPL_H
+#define MOCK_MODULAR_OBJECT_EXTENSION_CONTEXT_IMPL_H
+
+#include <cstddef>
+#include <memory>
+
+#include "extension_context.h"
+
+namespace OHOS {
+namespace AbilityRuntime {
+
+class ModularObjectExtensionContext : public ExtensionContext {
+public:
+    static const size_t CONTEXT_TYPE_ID;
+
+    // Pure declarations — definitions come from real .cpp (linked via BUILD.gn)
+    void SetEventHandler(const std::shared_ptr<AppExecFwk::EventHandler> &handler);
+
+    std::shared_ptr<AppExecFwk::EventHandler> GetEventHandler() const;
+
+    // Pure declarations — definitions come from real .cpp (linked via BUILD.gn)
+    ErrCode StartSelfUIAbility(const AAFwk::Want &want) const;
+
+    ErrCode StartSelfUIAbilityWithStartOptions(const AAFwk::Want &want,
+        const AAFwk::StartOptions &startOptions) const;
+
+    ErrCode TerminateSelf();
+
+    bool IsContext(size_t contextTypeId) { return contextTypeId == CONTEXT_TYPE_ID; }
+
+private:
+    std::weak_ptr<AppExecFwk::EventHandler> handler_;
+};
+
+} // namespace AbilityRuntime
+} // namespace OHOS
+
+#endif // MOCK_MODULAR_OBJECT_EXTENSION_CONTEXT_IMPL_H
diff --git a/test/unittest/modular_object_extension_context_impl_event_handler_test/mock/include/want.h b/test/unittest/modular_object_extension_context_impl_event_handler_test/mock/include/want.h
new file mode 100644
index 0000000000..09040fc870
--- /dev/null
+++ b/test/unittest/modular_object_extension_context_impl_event_handler_test/mock/include/want.h
@@ -0,0 +1,26 @@
+/*
+ * Copyright (c) 2026 Huawei Device Co., Ltd.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef MOCK_WANT_H
+#define MOCK_WANT_H
+
+typedef struct AbilityBase_Element {
+    char *bundleName;
+    char *moduleName;
+    char *abilityName;
+} AbilityBase_Element;
+
+typedef struct AbilityBase_Want AbilityBase_Want;
+#endif // MOCK_WANT_H
diff --git a/test/unittest/modular_object_extension_context_impl_event_handler_test/modular_object_extension_context_impl_event_handler_test.cpp b/test/unittest/modular_object_extension_context_impl_event_handler_test/modular_object_extension_context_impl_event_handler_test.cpp
new file mode 100644
index 0000000000..1d4d708060
--- /dev/null
+++ b/test/unittest/modular_object_extension_context_impl_event_handler_test/modular_object_extension_context_impl_event_handler_test.cpp
@@ -0,0 +1,113 @@
+/*
+ * Copyright (c) 2026 Huawei Device Co., Ltd.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <gtest/gtest.h>
+
+#include "modular_object_extension_context_impl.h"
+#include "extension_context.h"
+
+using namespace testing::ext;
+
+namespace OHOS {
+class MockRemoteObject : public IRemoteObject {
+public:
+    explicit MockRemoteObject(std::u16string desc) : IRemoteObject(desc) {}
+    int GetObjectRefCount() override { return 1; }
+    int SendRequest(uint32_t code, MessageParcel &data, MessageParcel &reply, MessageOption &option) override
+    {
+        return 0;
+    }
+    bool AddDeathRecipient(const sptr<DeathRecipient> &recipient) override { return true; }
+    bool RemoveDeathRecipient(const sptr<DeathRecipient> &recipient) override { return true; }
+    int Dump(int fd, const std::vector<std::u16string> &args) override { return 0; }
+};
+} // namespace OHOS
+
+namespace OHOS {
+namespace AbilityRuntime {
+
+class ModularObjectExtensionContextImplEventHandlerTest : public testing::Test {
+public:
+    static void SetUpTestCase() {}
+    static void TearDownTestCase() {}
+    void SetUp() override {}
+    void TearDown() override {}
+};
+
+class MockEventHandler : public AppExecFwk::EventHandler {
+};
+
+// ==================== SetEventHandler / GetEventHandler ====================
+// These tests target the REAL implementation in:
+//   frameworks/native/ability/native/modular_object_extension/modular_object_extension_context_impl.cpp
+
+HWTEST_F(ModularObjectExtensionContextImplEventHandlerTest, GetEventHandler_DefaultNull_001, TestSize.Level1)
+{
+    GTEST_LOG_(INFO) << "GetEventHandler_DefaultNull_001 start";
+    auto context = std::make_shared<ModularObjectExtensionContext>();
+    EXPECT_EQ(context->GetEventHandler(), nullptr);
+    GTEST_LOG_(INFO) << "GetEventHandler_DefaultNull_001 end";
+}
+
+HWTEST_F(ModularObjectExtensionContextImplEventHandlerTest, SetEventHandler_GetSameHandler_001, TestSize.Level1)
+{
+    GTEST_LOG_(INFO) << "SetEventHandler_GetSameHandler_001 start";
+    auto context = std::make_shared<ModularObjectExtensionContext>();
+    auto handler = std::make_shared<MockEventHandler>();
+    context->SetEventHandler(handler);
+    EXPECT_EQ(context->GetEventHandler(), handler);
+    GTEST_LOG_(INFO) << "SetEventHandler_GetSameHandler_001 end";
+}
+
+HWTEST_F(ModularObjectExtensionContextImplEventHandlerTest, GetEventHandler_HandlerExpired_001, TestSize.Level1)
+{
+    GTEST_LOG_(INFO) << "GetEventHandler_HandlerExpired_001 start";
+    auto context = std::make_shared<ModularObjectExtensionContext>();
+    auto handler = std::make_shared<MockEventHandler>();
+    context->SetEventHandler(handler);
+    handler.reset();
+    EXPECT_EQ(context->GetEventHandler(), nullptr);
+    GTEST_LOG_(INFO) << "GetEventHandler_HandlerExpired_001 end";
+}
+
+HWTEST_F(ModularObjectExtensionContextImplEventHandlerTest, SetEventHandler_NullHandler_001, TestSize.Level1)
+{
+    GTEST_LOG_(INFO) << "SetEventHandler_NullHandler_001 start";
+    auto context = std::make_shared<ModularObjectExtensionContext>();
+    context->SetEventHandler(nullptr);
+    EXPECT_EQ(context->GetEventHandler(), nullptr);
+    GTEST_LOG_(INFO) << "SetEventHandler_NullHandler_001 end";
+}
+
+HWTEST_F(ModularObjectExtensionContextImplEventHandlerTest, SetEventHandler_Overwrite_001, TestSize.Level1)
+{
+    GTEST_LOG_(INFO) << "SetEventHandler_Overwrite_001 start";
+    auto context = std::make_shared<ModularObjectExtensionContext>();
+    auto handler1 = std::make_shared<MockEventHandler>();
+    auto handler2 = std::make_shared<MockEventHandler>();
+
+    context->SetEventHandler(handler1);
+    EXPECT_EQ(context->GetEventHandler(), handler1);
+
+    context->SetEventHandler(handler2);
+    EXPECT_EQ(context->GetEventHandler(), handler2);
+
+    handler1.reset();
+    EXPECT_NE(context->GetEventHandler(), nullptr);
+    GTEST_LOG_(INFO) << "SetEventHandler_Overwrite_001 end";
+}
+
+} // namespace AbilityRuntime
+} // namespace OHOS
diff --git a/test/unittest/modular_object_extension_context_impl_test/mock/include/extension_context.h b/test/unittest/modular_object_extension_context_impl_test/mock/include/extension_context.h
index 3ec47f0f80..b245e41a4b 100644
--- a/test/unittest/modular_object_extension_context_impl_test/mock/include/extension_context.h
+++ b/test/unittest/modular_object_extension_context_impl_test/mock/include/extension_context.h
@@ -33,6 +33,13 @@ public:
 
 } // namespace AbilityRuntime
 
+namespace AppExecFwk {
+class EventHandler : public std::enable_shared_from_this<EventHandler> {
+public:
+    virtual ~EventHandler() = default;
+};
+} // namespace AppExecFwk
+
 namespace AAFwk {
 class Want {};
 
@@ -86,6 +93,13 @@ namespace AbilityRuntime {
 class ExtensionContext : public Context {
 public:
     sptr<IRemoteObject> token_;
+
+protected:
+    virtual bool IsContext(size_t contextTypeId)
+    {
+        (void)contextTypeId;
+        return false;
+    }
 };
 
 } // namespace AbilityRuntime
diff --git a/test/unittest/modular_object_extension_context_impl_test/mock/include/modular_object_extension_context_impl.h b/test/unittest/modular_object_extension_context_impl_test/mock/include/modular_object_extension_context_impl.h
index bfed546773..dfa3129491 100644
--- a/test/unittest/modular_object_extension_context_impl_test/mock/include/modular_object_extension_context_impl.h
+++ b/test/unittest/modular_object_extension_context_impl_test/mock/include/modular_object_extension_context_impl.h
@@ -26,6 +26,16 @@ class ModularObjectExtensionContext : public ExtensionContext {
 public:
     static const size_t CONTEXT_TYPE_ID;
 
+    void SetEventHandler(const std::shared_ptr<AppExecFwk::EventHandler> &handler)
+    {
+        handler_ = handler;
+    }
+
+    std::shared_ptr<AppExecFwk::EventHandler> GetEventHandler() const
+    {
+        return handler_.lock();
+    }
+
     ErrCode StartSelfUIAbility(const AAFwk::Want &want) const
     {
         return AAFwk::AbilityManagerClient::GetInstance()->StartSelfUIAbility(want);
@@ -43,6 +53,9 @@ public:
     }
 
     bool IsContext(size_t contextTypeId) { return contextTypeId == CONTEXT_TYPE_ID; }
+
+private:
+    std::weak_ptr<AppExecFwk::EventHandler> handler_;
 };
 
 } // namespace AbilityRuntime
diff --git a/test/unittest/modular_object_extension_context_impl_test/modular_object_extension_context_impl_test.cpp b/test/unittest/modular_object_extension_context_impl_test/modular_object_extension_context_impl_test.cpp
index 2ec8727b86..228b980f80 100644
--- a/test/unittest/modular_object_extension_context_impl_test/modular_object_extension_context_impl_test.cpp
+++ b/test/unittest/modular_object_extension_context_impl_test/modular_object_extension_context_impl_test.cpp
@@ -64,6 +64,40 @@ public:
     void TearDown() override {}
 };
 
+class MockEventHandler : public AppExecFwk::EventHandler {
+};
+
+// ==================== EventHandler ====================
+
+HWTEST_F(ModularObjectExtensionContextImplTest, GetEventHandler_DefaultNull_001, TestSize.Level1)
+{
+    GTEST_LOG_(INFO) << "GetEventHandler_DefaultNull_001 start";
+    auto context = std::make_shared<ModularObjectExtensionContext>();
+    EXPECT_EQ(context->GetEventHandler(), nullptr);
+    GTEST_LOG_(INFO) << "GetEventHandler_DefaultNull_001 end";
+}
+
+HWTEST_F(ModularObjectExtensionContextImplTest, SetEventHandler_GetSameHandler_001, TestSize.Level1)
+{
+    GTEST_LOG_(INFO) << "SetEventHandler_GetSameHandler_001 start";
+    auto context = std::make_shared<ModularObjectExtensionContext>();
+    auto handler = std::make_shared<MockEventHandler>();
+    context->SetEventHandler(handler);
+    EXPECT_EQ(context->GetEventHandler(), handler);
+    GTEST_LOG_(INFO) << "SetEventHandler_GetSameHandler_001 end";
+}
+
+HWTEST_F(ModularObjectExtensionContextImplTest, GetEventHandler_HandlerExpired_001, TestSize.Level1)
+{
+    GTEST_LOG_(INFO) << "GetEventHandler_HandlerExpired_001 start";
+    auto context = std::make_shared<ModularObjectExtensionContext>();
+    auto handler = std::make_shared<MockEventHandler>();
+    context->SetEventHandler(handler);
+    handler.reset();
+    EXPECT_EQ(context->GetEventHandler(), nullptr);
+    GTEST_LOG_(INFO) << "GetEventHandler_HandlerExpired_001 end";
+}
+
 // ==================== StartSelfUIAbility ====================
 
 HWTEST_F(ModularObjectExtensionContextImplTest, StartSelfUIAbility_Success_001, TestSize.Level1)
diff --git a/test/unittest/modular_object_extension_test/mock/include/ability_handler.h b/test/unittest/modular_object_extension_test/mock/include/ability_handler.h
new file mode 100644
index 0000000000..185329a78e
--- /dev/null
+++ b/test/unittest/modular_object_extension_test/mock/include/ability_handler.h
@@ -0,0 +1,37 @@
+/*
+ * Copyright (c) 2026 Huawei Device Co., Ltd.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef MOCK_ABILITY_HANDLER_H
+#define MOCK_ABILITY_HANDLER_H
+
+#include <memory>
+
+namespace OHOS {
+namespace AppExecFwk {
+class EventHandler : public std::enable_shared_from_this<EventHandler> {
+public:
+    virtual ~EventHandler() = default;
+};
+} // namespace AppExecFwk
+
+namespace AbilityRuntime {
+class AbilityHandler : public AppExecFwk::EventHandler {
+public:
+    ~AbilityHandler() override = default;
+};
+} // namespace AbilityRuntime
+} // namespace OHOS
+
+#endif // MOCK_ABILITY_HANDLER_H
\ No newline at end of file
diff --git a/test/unittest/modular_object_extension_test/mock/include/extension.h b/test/unittest/modular_object_extension_test/mock/include/extension.h
index 301b95afc0..8cebaba085 100644
--- a/test/unittest/modular_object_extension_test/mock/include/extension.h
+++ b/test/unittest/modular_object_extension_test/mock/include/extension.h
@@ -18,6 +18,7 @@
 
 #include <memory>
 #include <string>
+#include "ability_handler.h"
 #include "mock_types.h"
 #include "refbase.h"
 #include "iremote_object.h"
@@ -27,7 +28,6 @@ namespace AbilityRuntime {
 
 class AbilityLocalRecord {};
 class OHOSApplication {};
-class AbilityHandler {};
 
 struct AbilityInfo {
     std::string srcEntrance;
diff --git a/test/unittest/modular_object_extension_test/mock/include/modular_object_extension_context_impl.h b/test/unittest/modular_object_extension_test/mock/include/modular_object_extension_context_impl.h
index ba35759e66..654653ee5b 100644
--- a/test/unittest/modular_object_extension_test/mock/include/modular_object_extension_context_impl.h
+++ b/test/unittest/modular_object_extension_test/mock/include/modular_object_extension_context_impl.h
@@ -26,6 +26,11 @@ namespace AbilityRuntime {
 class ModularObjectExtensionContext : public Context {
 public:
     ModularObjectExtensionContext() = default;
+
+    void SetEventHandler(const std::shared_ptr<AppExecFwk::EventHandler> &handler)
+    {
+        (void)handler;
+    }
 };
 
 } // namespace AbilityRuntime