diff --git a/RichPreviewer.cpp b/RichPreviewer.cpp
index 88afe0b..5dedc85 100644
--- a/RichPreviewer.cpp
+++ b/RichPreviewer.cpp
@@ -180,5 +180,6 @@ int main(int argc, char* argv[])
     std::thread commandThead(ProcessCommand);
     commandThead.detach();
     InitJsApp();
+    this_thread::sleep_for(chrono::milliseconds(500));
     return 0;
 }
diff --git a/ThinPreviewer.cpp b/ThinPreviewer.cpp
index 557d37d..d2116d7 100644
--- a/ThinPreviewer.cpp
+++ b/ThinPreviewer.cpp
@@ -190,5 +190,6 @@ int main(int argc, char* argv[])
         this_thread::sleep_for(chrono::milliseconds(1));
     }
     JsAppImpl::GetInstance().Stop();
+    this_thread::sleep_for(chrono::milliseconds(500));
     return 0;
 }
diff --git a/automock/mock-generate/src/generate/generateClassDeclaration.ts b/automock/mock-generate/src/generate/generateClassDeclaration.ts
index d13851b..344608c 100644
--- a/automock/mock-generate/src/generate/generateClassDeclaration.ts
+++ b/automock/mock-generate/src/generate/generateClassDeclaration.ts
@@ -54,6 +54,10 @@ export function generateClassDeclaration(rootName: string, classEntity: ClassEnt
         isExtend = true;
         classBody += `${value.clauseToken} `;
         value.types.forEach((val, index) => {
+          const moduleName = firstCharacterToUppercase(rootName);
+          if (classEntity.exportModifiers.includes(SyntaxKind.ExportKeyword) && rootName !== '') {
+            val = `mock${moduleName}().${val}`;
+          }
           if (index !== value.types.length - 1) {
             classBody += `${val},`;
           } else {
diff --git a/jsapp/lite/JsAppImpl.cpp b/jsapp/lite/JsAppImpl.cpp
index e565992..f2accc8 100644
--- a/jsapp/lite/JsAppImpl.cpp
+++ b/jsapp/lite/JsAppImpl.cpp
@@ -126,14 +126,9 @@ JsAppImpl& JsAppImpl::GetInstance()
 
 void JsAppImpl::Start()
 {
-    if (jsThread != nullptr) {
-        delete jsThread;
-        jsThread = nullptr;
-    }
-
     isFinished = false;
     isInterrupt = false;
-    jsThread = new thread(&JsAppImpl::ThreadCallBack, &JsAppImpl::GetInstance());
+    jsThread = std::make_unique<std::thread>(&JsAppImpl::ThreadCallBack, &JsAppImpl::GetInstance());
     if (jsThread == nullptr) {
         ELOG("JsApp::Start jsThread memory allocation failed");
     }
diff --git a/jsapp/lite/JsAppImpl.h b/jsapp/lite/JsAppImpl.h
index b016cb0..79bb6f3 100644
--- a/jsapp/lite/JsAppImpl.h
+++ b/jsapp/lite/JsAppImpl.h
@@ -45,7 +45,7 @@ private:
     std::unique_ptr<CppTimer> deviceCheckTimer;
     std::unique_ptr<CppTimer> jsCheckTimer;
     std::unique_ptr<OHOS::ACELite::JSAbility> jsAbility;
-    std::thread* jsThread;
+    std::unique_ptr<std::thread> jsThread;
 
     void ThreadCallBack();
     void InitTimer();
diff --git a/util/WebSocketServer.cpp b/util/WebSocketServer.cpp
index c958726..b09dea9 100644
--- a/util/WebSocketServer.cpp
+++ b/util/WebSocketServer.cpp
@@ -118,11 +118,8 @@ void WebSocketServer::StartWebsocketListening()
 
 void WebSocketServer::Run()
 {
-    if (serverThread != nullptr) {
-        delete serverThread;
-        serverThread = nullptr;
-    }
-    serverThread = new std::thread(&WebSocketServer::StartWebsocketListening, &WebSocketServer::GetInstance());
+    serverThread = std::make_unique<std::thread>(&WebSocketServer::StartWebsocketListening,
+                                                &WebSocketServer::GetInstance());
     if (serverThread == nullptr) {
         ELOG("WebSocketServer::Start serverThread memory allocation failed");
     }
diff --git a/util/WebSocketServer.h b/util/WebSocketServer.h
index 340275c..53bc41a 100644
--- a/util/WebSocketServer.h
+++ b/util/WebSocketServer.h
@@ -41,7 +41,7 @@ private:
     WebSocketServer();
     virtual ~WebSocketServer();
     static void sigint_handler(int sig);
-    std::thread* serverThread;
+    std::unique_ptr<std::thread> serverThread;
     int serverPort;
     const char* serverHostname = "127.0.0.1";
     int websocketMaxConn = 1024;
diff --git a/util/unix/CrashHandler.cpp b/util/unix/CrashHandler.cpp
index fe9e025..2099a6b 100644
--- a/util/unix/CrashHandler.cpp
+++ b/util/unix/CrashHandler.cpp
@@ -26,6 +26,9 @@
 
 using namespace std;
 
+static void *oldBacetrace[10] = { nullptr };
+static size_t oldSize = 0;
+
 void CrashHandler::InitExceptionHandler()
 {
     if (signal(SIGSEGV, ApplicationCrashHandler) == SIG_ERR) {
@@ -36,7 +39,23 @@ void CrashHandler::InitExceptionHandler()
 
 void CrashHandler::ApplicationCrashHandler(int signal)
 {
+    // get void*'s for all entries on the stack
     const uint32_t MAX_STACK_SIZE = 128;
+    int len = 10;
+    void *array[len];
+    size_t size = backtrace(array, MAX_STACK_SIZE);
+    bool isSame = true;
+    if (oldSize == size) {
+        for (size_t i = 0; i < size; i++) {
+            if (oldBacetrace[i] != array[i]) {
+                isSame = false;
+            }
+        }
+    }
+    if (isSame) {
+        return;
+    }
+    // print crash log head
     int8_t crashBeginLog[] = "[JsEngine Crash]Engine Crash Info Begin.\n";
     write(STDERR_FILENO, crashBeginLog, sizeof(crashBeginLog) - 1);
     int8_t stackIntLog[PublicMethods::MAX_ITOA_BIT] = {0};
@@ -44,13 +63,12 @@ void CrashHandler::ApplicationCrashHandler(int signal)
     int8_t signalLog[] = "[JsEngine Crash]Error: signal : 0x";
     write(STDERR_FILENO, signalLog, sizeof(signalLog) - 1);
     write(STDERR_FILENO, stackIntLog, itoaLength);
-
-    // get void*'s for all entries on the stack
-    void *array[10];
-    size_t size = backtrace(array, MAX_STACK_SIZE);
     // print out all the frames to stdout
     backtrace_symbols_fd(array, size, STDERR_FILENO);
-
+    std::fill(oldBacetrace, oldBacetrace + len, nullptr);
+    std::copy(array, array + len, oldBacetrace);
+    oldSize = size;
+    // print crash log end
     int8_t crashEndLog[] = "\n[JsEngine Crash]Engine Crash Info End.\n";
     write(STDERR_FILENO, crashEndLog, sizeof(crashEndLog) - 1);
-}
+}
\ No newline at end of file