diff --git a/python/paddle_serving_server/monitor.py b/python/paddle_serving_server/monitor.py
index e34cf2476fcaa5febe8cd29849a0dcfc0e96265e..74de76b3de3f3aff36230d94c477b1141c8d2d65 100644
--- a/python/paddle_serving_server/monitor.py
+++ b/python/paddle_serving_server/monitor.py
@@ -126,6 +126,7 @@ class FTPMonitor(Monitor):
         self._ftp.login(username, password)
 
     def _exist_remote_donefile(self):
+        import ftplib
         try:
             donefile_path = '{}/{}'.format(self._remote_path,
                                            self._remote_donefile_name)