diff --git a/python/paddle/trainer/config_parser.py b/python/paddle/trainer/config_parser.py
index dd159f22d97f48e8f48229bdf79970e3f09af3a0..8b02be9af1a82ba915589ed91d2acfbf23f6e22e 100644
--- a/python/paddle/trainer/config_parser.py
+++ b/python/paddle/trainer/config_parser.py
@@ -895,7 +895,7 @@ class MaxOut(Cfg):
 
 
 def create_data_config_proto(async_load_data=False,
-                             onstant_slots=None,
+                             constant_slots=None,
                              data_ratio=1,
                              is_main_data=True,
                              usage_ratio=None):