diff --git a/python/paddle/v2/fluid/layers/control_flow.py b/python/paddle/v2/fluid/layers/control_flow.py
index 787a3153f401dc2bf9a2350fdde24a7c5aa94e89..948a67524490ec7dcf84ef9af48be54f0fc0f908 100644
--- a/python/paddle/v2/fluid/layers/control_flow.py
+++ b/python/paddle/v2/fluid/layers/control_flow.py
@@ -998,7 +998,7 @@ class ConditionalBlock(object):
 
         out_list = [
             parent_block.var(var_name) for var_name in parent_block.vars
-            if var_name not in intermediate
+            if var_name in intermediate
         ]
 
         step_scope = parent_block.create_var(