diff --git a/python/paddle/trainer/config_parser.py b/python/paddle/trainer/config_parser.py
index e3e2a6899e7fa7e04b7775e68eabb72c37367b34..dd159f22d97f48e8f48229bdf79970e3f09af3a0 100644
--- a/python/paddle/trainer/config_parser.py
+++ b/python/paddle/trainer/config_parser.py
@@ -895,10 +895,10 @@ class MaxOut(Cfg):
 
 
 def create_data_config_proto(async_load_data=False,
-             constant_slots=None,
-             data_ratio=1,
-             is_main_data=True,
-             usage_ratio=None):
+                             onstant_slots=None,
+                             data_ratio=1,
+                             is_main_data=True,
+                             usage_ratio=None):
     # default: all sub dataproviders are treat as "main data".
     # see proto/DataConfig.proto for is_main_data
     data_config = DataConfig()