diff --git a/python/paddle/fluid/layers/control_flow.py b/python/paddle/fluid/layers/control_flow.py
index dee41448081cbfcd8224ce2abbf3ba7b7b97eb7c..d1ea9f148566d20988a43f4c9d421c4452697ef1 100644
--- a/python/paddle/fluid/layers/control_flow.py
+++ b/python/paddle/fluid/layers/control_flow.py
@@ -1098,7 +1098,7 @@ class ConditionalBlock(object):
         input_set = set([ipt.name for ipt in self.inputs])
 
         param_list = [
-            parent_block.var(each_name) for each_name in params
+            parent_block.var_recursive(each_name) for each_name in params
             if each_name not in input_set
         ]