diff --git a/python/paddle/v2/event.py b/python/paddle/v2/event.py
index 8cbf9b9b1faac0ee0875297756853e632e4f2498..a429e36b63c9e812332673b66f4d8b99f3303cf8 100644
--- a/python/paddle/v2/event.py
+++ b/python/paddle/v2/event.py
@@ -53,9 +53,8 @@ class EndPass(WithMetric):
     Event On One Pass Training Complete.
     """
 
-    def __init__(self, pass_id, cost, evaluator):
+    def __init__(self, pass_id, evaluator):
         self.pass_id = pass_id
-        self.cost = cost
         WithMetric.__init__(self, evaluator)