diff --git a/frameworks/inputmethod_ability/src/input_method_ability.cpp b/frameworks/inputmethod_ability/src/input_method_ability.cpp
index 7e6ddfb..7a26b6b 100644
--- a/frameworks/inputmethod_ability/src/input_method_ability.cpp
+++ b/frameworks/inputmethod_ability/src/input_method_ability.cpp
@@ -426,7 +426,8 @@ namespace MiscServices {
         return;
     }
 
-    int32_t InputMethodAbility::GetEnterKeyType() {
+    int32_t InputMethodAbility::GetEnterKeyType()
+    {
         IMSA_HILOGI("InputMethodAbility::GetEnterKeyType");
 
         if (inputDataChannel == nullptr) {
@@ -436,7 +437,8 @@ namespace MiscServices {
         return inputDataChannel->GetEnterKeyType();
     }
 
-    int32_t InputMethodAbility::GetInputPattern() {
+    int32_t InputMethodAbility::GetInputPattern()
+    {
         IMSA_HILOGI("InputMethodAbility::GetInputPattern");
 
         if (inputDataChannel == nullptr) {
@@ -446,7 +448,8 @@ namespace MiscServices {
         return inputDataChannel->GetInputPattern();
     }
 
-    void InputMethodAbility::StopInput() {
+    void InputMethodAbility::StopInput()
+    {
         IMSA_HILOGI("InputMethodAbility::StopInput");
 
         if (inputDataChannel == nullptr) {
diff --git a/frameworks/inputmethod_ability/src/input_method_core_proxy.cpp b/frameworks/inputmethod_ability/src/input_method_core_proxy.cpp
index ba952c1..9e24df4 100644
--- a/frameworks/inputmethod_ability/src/input_method_core_proxy.cpp
+++ b/frameworks/inputmethod_ability/src/input_method_core_proxy.cpp
@@ -78,6 +78,7 @@ namespace MiscServices {
         sptr<IRemoteObject> channelObject = inputControlChannel->AsObject();
         if (channelObject == nullptr) {
             IMSA_HILOGI("InputMethodCoreProxy::InitInputControlChannel channelObject is nullptr");
+            return ErrorCode::ERROR_EX_NULL_POINTER;
         }
         data.WriteRemoteObject(channelObject);
         MessageOption option {
diff --git a/interfaces/kits/js/napi/inputmethodengine/src/js_editor_attribute.cpp b/interfaces/kits/js/napi/inputmethodengine/src/js_editor_attribute.cpp
index b833d92..9612dd9 100644
--- a/interfaces/kits/js/napi/inputmethodengine/src/js_editor_attribute.cpp
+++ b/interfaces/kits/js/napi/inputmethodengine/src/js_editor_attribute.cpp
@@ -22,8 +22,6 @@
 #include "input_method_ability.h"
 namespace OHOS {
 namespace MiscServices {
-//    constexpr size_t ARGC_ZERO = 0;
-
     void JsEditorAttribute::Finalizer(NativeEngine* engine, void* data, void* hint)
     {
         IMSA_HILOGI("JsEditorAttribute::Finalizer is called");
diff --git a/services/src/input_method_system_ability.cpp b/services/src/input_method_system_ability.cpp
index 177e6fb..ed92d25 100644
--- a/services/src/input_method_system_ability.cpp
+++ b/services/src/input_method_system_ability.cpp
@@ -884,6 +884,7 @@ namespace MiscServices {
             IMSA_HILOGI("InputMethodSystemAbility::OnDisplayOptionalInputMethod has no ime");
             return;
         }
+
         std::string defaultIme = ParaHandle::GetDefaultIme(userId_);
         std::string params = "";
         std::vector<InputMethodProperty*>::iterator it;
diff --git a/services/src/platform_callback_stub.cpp b/services/src/platform_callback_stub.cpp
index e90a4e7..352b006 100644
--- a/services/src/platform_callback_stub.cpp
+++ b/services/src/platform_callback_stub.cpp
@@ -34,6 +34,10 @@ namespace MiscServices {
     int PlatformCallbackStub::OnRemoteRequest(uint32_t code, MessageParcel& data, MessageParcel& reply,
                                               MessageOption& option)
     {
+        auto descriptorToken = data.ReadInterfaceToken();
+        if (descriptorToken != GetDescriptor()) {
+            return ErrorCode::ERROR_STATUS_UNKNOWN_TRANSACTION;
+        }
         switch (code) {
             case NOTIFY_EVENT: {
                 int eventId = data.ReadInt32();