diff --git a/python/pipeline/operator.py b/python/pipeline/operator.py
index 3b3f58a168938d7c62a2d7e9e0246c925cd1a12f..d2323f265c7fac65bc97d9b8d9a3dea8afe4cf2e 100644
--- a/python/pipeline/operator.py
+++ b/python/pipeline/operator.py
@@ -60,6 +60,10 @@ class Op(object):
         self._outputs = []
         self._profiler = None
 
+        # only for multithread
+        self._for_init_op_lock = threading.Lock()
+        self._succ_init_op = False
+
     def init_profiler(self, profiler):
         self._profiler = profiler
 
@@ -180,13 +184,6 @@ class Op(object):
         return proces
 
     def start_with_thread(self, client_type):
-        # load user resources
-        try:
-            self.init_op()
-        except Exception as e:
-            _LOGGER.error(e)
-            os._exit(-1)
-
         threads = []
         for concurrency_idx in range(self.concurrency):
             t = threading.Thread(
@@ -330,8 +327,8 @@ class Op(object):
 
         client = None
         client_predict_handler = None
+        # create client based on client_type
         try:
-            # create client based on client_type
             client = self.init_client(client_type, self._client_config,
                                       self._server_endpoints, self._fetch_names)
             if client is not None:
@@ -340,13 +337,18 @@ class Op(object):
             _LOGGER.error(log(e))
             os._exit(-1)
 
-        if not use_multithread:
-            # load user resources
-            try:
+        # load user resources
+        try:
+            if use_multithread:
+                with self._for_init_op_lock:
+                    if not self._succ_init_op:
+                        self.init_op()
+                        self._succ_init_op = True
+            else:
                 self.init_op()
-            except Exception as e:
-                _LOGGER.error(log(e))
-                os._exit(-1)
+        except Exception as e:
+            _LOGGER.error(log(e))
+            os._exit(-1)
 
         self._is_run = True
         while self._is_run: