diff --git a/fastdeploy/splitwise/internal_adapter_utils.py b/fastdeploy/splitwise/internal_adapter_utils.py
index db3ea520d..dc0ddf544 100644
--- a/fastdeploy/splitwise/internal_adapter_utils.py
+++ b/fastdeploy/splitwise/internal_adapter_utils.py
@@ -43,6 +43,7 @@ class InternalAdapter:
             target=self._response_external_module_control_instruct, daemon=True
         )
         self.response_external_instruct_thread.start()
+        self.response_lock = threading.Lock()  # prevent to call send_multipart in zmq concurrently
 
     def _get_current_server_info(self):
         """
@@ -76,7 +77,8 @@ class InternalAdapter:
                     payload_info = self._get_current_server_info()
                     result = {"task_id": task_id_str, "result": payload_info}
                     logger.info(f"Response for task: {task_id_str}")
-                    self.recv_control_cmd_server.response_for_control_cmd(task_id_str, result)
+                    with self.response_lock:
+                        self.recv_control_cmd_server.response_for_control_cmd(task_id_str, result)
 
                 elif task["cmd"] == "get_metrics":
                     metrics_text = get_filtered_metrics(
@@ -85,7 +87,8 @@ class InternalAdapter:
                     )
                     result = {"task_id": task_id_str, "result": metrics_text}
                     logger.info(f"Response for task: {task_id_str}")
-                    self.recv_control_cmd_server.response_for_control_cmd(task_id_str, result)
+                    with self.response_lock:
+                        self.recv_control_cmd_server.response_for_control_cmd(task_id_str, result)
                 elif task["cmd"] == "connect_rdma":
                     self.engine.engine_worker_queue.put_connect_rdma_task(task)
 
@@ -100,7 +103,8 @@ class InternalAdapter:
                     task_id_str = result_data["task_id"]
                     result = {"task_id": task_id_str, "result": result_data}
                     logger.info(f"Response for task: {task_id_str}")
-                    self.recv_control_cmd_server.response_for_control_cmd(task_id_str, result)
+                    with self.response_lock:
+                        self.recv_control_cmd_server.response_for_control_cmd(task_id_str, result)
                 else:
                     time.sleep(0.001)
             except Exception as e: