diff --git a/PaddleCV/PaddleDetection/tools/infer.py b/PaddleCV/PaddleDetection/tools/infer.py
index c70ce05012e532b7bf0e69442c306cb7fa1dd7bb..6dfd5a85be8e043688dabea95cbbad1c61d106ab 100644
--- a/PaddleCV/PaddleDetection/tools/infer.py
+++ b/PaddleCV/PaddleDetection/tools/infer.py
@@ -97,7 +97,7 @@ def save_infer_model(FLAGS, exe, feed_vars, test_fetches, infer_prog):
                                   target_vars=target_vars,
                                   executor=exe,
                                   main_program=infer_prog,
-                                  params_filename="__parmas__")
+                                  params_filename="__params__")
 
 
 def main():