diff --git a/python/paddle_serving_client/__init__.py b/python/paddle_serving_client/__init__.py
index 7c7cc37f9e3bba593965110e0c76a29f18d505d9..09d3a7e2a72d871d0b6015747150bd27be6cde27 100644
--- a/python/paddle_serving_client/__init__.py
+++ b/python/paddle_serving_client/__init__.py
@@ -128,7 +128,7 @@ class Client(object):
         ld_path = os.getenv('LD_LIBRARY_PATH')
         if ld_path == None:
             os.environ['LD_LIBRARY_PATH'] = lib_path
-        else:
+        elif ld_path not in lib_path:
             os.environ['LD_LIBRARY_PATH'] = ld_path + ':' + lib_path
 
     def load_client_config(self, path):