diff --git a/python/paddle/fluid/io.py b/python/paddle/fluid/io.py
index 792d0f7bf512c97a700b14be7c0113ac1e1b483b..dd312bce11763f3d6e4fc23ce624b29489cbba99 100644
--- a/python/paddle/fluid/io.py
+++ b/python/paddle/fluid/io.py
@@ -111,7 +111,7 @@ def is_persistable(var):
 
 
 def is_belong_to_optimizer(var):
-    if not isinstance(var, Parameter) or var.desc.need_check_feed():
+    if not (isinstance(var, Parameter) or var.desc.need_check_feed()):
         return is_persistable(var)
 
     return False