diff --git a/services/samgr/native/include/concurrent_map.h b/services/samgr/native/include/concurrent_map.h
index 3c58198dadd5625743f6e4f1c205d4f512af40f5..58c8f2f4388ede458fcf90d6fe358c5a624654b1 100644
--- a/services/samgr/native/include/concurrent_map.h
+++ b/services/samgr/native/include/concurrent_map.h
@@ -62,6 +62,19 @@ public:
         return ret.second;
     }
 
+    bool FirstInsert(const K &key, const V &value)
+    {
+        std::lock_guard<std::mutex> lock(mutex_);
+        auto isFirst = map_.empty();
+        auto ret = map_.insert(std::pair<K, V>(key, value));
+        // find key and cannot insert
+        if (!ret.second) {
+            map_.erase(ret.first);
+            map_.insert(std::pair<K, V>(key, value));
+        }
+        return isFirst;
+    }
+
     void EnsureInsert(const K &key, const V &value)
     {
         std::lock_guard<std::mutex> lock(mutex_);
diff --git a/services/samgr/native/include/samgr_time_handler.h b/services/samgr/native/include/samgr_time_handler.h
index 0aa9f5aa93ba226605a74d304d7b1ab3b7552c49..aa2be4f5b00dc98f40540e911f422b722e2aaca8 100644
--- a/services/samgr/native/include/samgr_time_handler.h
+++ b/services/samgr/native/include/samgr_time_handler.h
@@ -54,7 +54,6 @@ private:
 
 private:
     int epollfd = -1;
-    std::atomic<bool> flag = false;
     ConcurrentMap <uint32_t, TaskType> timeFunc;
     static SamgrTimeHandler* volatile singleton;
     static Deletor deletor;
diff --git a/services/samgr/native/source/samgr_time_handler.cpp b/services/samgr/native/source/samgr_time_handler.cpp
index c341e1539a27cee6119dcf3c098fc15caf2752a8..d0b97552d9c7e5442d3caa4b6d32b6f701dbafe3 100644
--- a/services/samgr/native/source/samgr_time_handler.cpp
+++ b/services/samgr/native/source/samgr_time_handler.cpp
@@ -46,8 +46,6 @@ SamgrTimeHandler::SamgrTimeHandler()
     if (epollfd == -1) {
         HILOGE("SamgrTimeHandler epoll_create error");
     }
-    flag = false;
-    StartThread();
 }
 
 void SamgrTimeHandler::StartThread()
@@ -59,11 +57,9 @@ void SamgrTimeHandler::StartThread()
             int number = epoll_wait(this->epollfd, events, MAX_EVENT, -1);
             OnTime((*this), number, events);
         }
-        this->flag = false;
         HILOGI("SamgrTimeHandler thread end");
     };
     std::thread t(func);
-    this->flag = true;
     t.detach();
 }
 
@@ -141,8 +137,8 @@ bool SamgrTimeHandler::PostTask(TaskType func, uint64_t delayTime)
         ::close(timerfd);
         return false;
     }
-    timeFunc.EnsureInsert(timerfd, func);
-    if (!flag) {
+    auto isFirst = timeFunc.FirstInsert(timerfd, func);
+    if (isFirst) {
         StartThread();
     }
     return true;