diff --git a/services/sandbox_manager/main/cpp/include/service/sandbox_manager_service.h b/services/sandbox_manager/main/cpp/include/service/sandbox_manager_service.h
index 20f0ac42b31a4e183252d68bc56db0bde3dec6fc..57926702c77d6cf87d9e839c19c0e782b85f33c4 100644
--- a/services/sandbox_manager/main/cpp/include/service/sandbox_manager_service.h
+++ b/services/sandbox_manager/main/cpp/include/service/sandbox_manager_service.h
@@ -66,12 +66,15 @@ public:
     
 private:
     bool Initialize();
+    bool InitDelayUnloadHandler();
     void OnAddSystemAbility(int32_t systemAbilityId, const std::string& deviceId) override;
     bool StartByEventAction(const SystemAbilityOnDemandReason& startReason);
 
     std::mutex stateMutex_;
     ServiceRunningState state_;
+    std::mutex unloadMutex_;
     std::shared_ptr<EventHandler> unloadHandler_ = nullptr;
+    std::shared_ptr<EventRunner> unloadRunner_ = nullptr;
 };
 } // namespace SandboxManager
 } // namespace AccessControl
diff --git a/services/sandbox_manager/main/cpp/src/service/sandbox_manager_service.cpp b/services/sandbox_manager/main/cpp/src/service/sandbox_manager_service.cpp
index 3bcc3249762708e6832741ee1f34b627edeee2aa..c7c7f99eae4511fb09ca5940a813c3b46c06ad57 100644
--- a/services/sandbox_manager/main/cpp/src/service/sandbox_manager_service.cpp
+++ b/services/sandbox_manager/main/cpp/src/service/sandbox_manager_service.cpp
@@ -82,6 +82,7 @@ void SandboxManagerService::OnStart()
         SANDBOXMANAGER_LOG_ERROR(LABEL, "Failed to publish service! ");
         return;
     }
+    DelayUnloadService();
     SANDBOXMANAGER_LOG_INFO(LABEL, "SandboxManagerService start successful.");
 }
 
@@ -125,6 +126,8 @@ void SandboxManagerService::OnStart(const SystemAbilityOnDemandReason& startReas
         SANDBOXMANAGER_LOG_ERROR(LABEL, "Failed to publish service.");
         return;
     }
+    DelayUnloadService();
+    SANDBOXMANAGER_LOG_INFO(LABEL, "SandboxManagerService start successful.");
 }
 
 int32_t SandboxManagerService::CleanPersistPolicyByPath(const std::vector<std::string>& filePathList)
@@ -330,7 +333,6 @@ int32_t SandboxManagerService::UnSetAllPolicyByToken(uint32_t tokenId)
 
 bool SandboxManagerService::Initialize()
 {
-    DelayUnloadService();
     PolicyInfoManager::GetInstance().Init();
     AddSystemAbilityListener(COMMON_EVENT_SERVICE_ID);
     return true;
@@ -343,14 +345,31 @@ void SandboxManagerService::OnAddSystemAbility(int32_t systemAbilityId, const st
     }
 }
 
-void SandboxManagerService::DelayUnloadService()
+bool SandboxManagerService::InitDelayUnloadHandler()
 {
+    if ((unloadRunner_ != nullptr) && (unloadHandler_ != nullptr)) {
+        SANDBOXMANAGER_LOG_INFO(LABEL, "UnloadRunner_ and UnloadHandler_ already init.");
+        return true;
+    }
+    unloadRunner_ = EventRunner::Create(SA_ID_SANDBOX_MANAGER_SERVICE, AppExecFwk::ThreadMode::FFRT);
+    if (unloadRunner_ == nullptr) {
+        SANDBOXMANAGER_LOG_ERROR(LABEL, "UnloadRunner_ init failed.");
+        return false;
+    }
+    unloadHandler_ = std::make_shared<EventHandler>(unloadRunner_);
     if (unloadHandler_ == nullptr) {
-        std::shared_ptr<EventRunner> runner
-            = EventRunner::Create(SA_ID_SANDBOX_MANAGER_SERVICE);
-        unloadHandler_ = std::make_shared<EventHandler>(runner);
+        SANDBOXMANAGER_LOG_ERROR(LABEL, "UnloadHandler_ init failed.");
+        return false;
     }
+    return true;
+}
 
+void SandboxManagerService::DelayUnloadService()
+{
+    std::lock_guard<std::mutex> lock(unloadMutex_);
+    if (!InitDelayUnloadHandler()) {
+        return;
+    }
     auto task = [this]() {
         auto samgrProxy = OHOS::SystemAbilityManagerClient::GetInstance().GetSystemAbilityManager();
         if (samgrProxy == nullptr) {
@@ -365,6 +384,7 @@ void SandboxManagerService::DelayUnloadService()
     };
     unloadHandler_->RemoveTask("SandboxManagerUnload");
     unloadHandler_->PostTask(task, "SandboxManagerUnload", SA_LIFE_TIME);
+    SANDBOXMANAGER_LOG_INFO(LABEL, "Delay unload task updated.");
 }
 
 bool SandboxManagerService::StartByEventAction(const SystemAbilityOnDemandReason& startReason)
diff --git a/services/sandbox_manager/main/cpp/src/service/sandbox_manager_stub.cpp b/services/sandbox_manager/main/cpp/src/service/sandbox_manager_stub.cpp
index 8e90e9e1d744eed73d1d43fa707f45675fe40298..6287dc5b9cdbaa7c1e6f70037b2ff2aaa9dab94d 100644
--- a/services/sandbox_manager/main/cpp/src/service/sandbox_manager_stub.cpp
+++ b/services/sandbox_manager/main/cpp/src/service/sandbox_manager_stub.cpp
@@ -53,11 +53,11 @@ int32_t SandboxManagerStub::OnRemoteRequest(
         SANDBOXMANAGER_LOG_ERROR(LABEL, "get unexpect descriptor: %{public}s", Str16ToStr8(descriptor).c_str());
         return -1;
     }
-    DelayUnloadService();
     auto itFunc = requestFuncMap_.find(code);
     if (itFunc != requestFuncMap_.end()) {
         auto requestFunc = itFunc->second;
         if (requestFunc != nullptr) {
+            DelayUnloadService();
             return (this->*requestFunc)(data, reply);
         } else {
             // when valid code without any function to handle