diff --git a/python/paddle/v2/fluid/nets.py b/python/paddle/v2/fluid/nets.py
index 6cc372bcb6de8b6f95b821f20612a5dec05a87ff..2b8b8c2941f0853c425d4f57aea9c8440edb8b4b 100644
--- a/python/paddle/v2/fluid/nets.py
+++ b/python/paddle/v2/fluid/nets.py
@@ -52,7 +52,7 @@ def img_conv_group(input,
                    conv_act=None,
                    param_attr=None,
                    conv_with_batchnorm=False,
-                   conv_batchnorm_drop_rate=0,
+                   conv_batchnorm_drop_rate=0.0,
                    pool_stride=1,
                    pool_type=None):
     """