diff --git a/doc/SAVE.md b/doc/SAVE.md
index a1ff13f1e0c095b737388071190970fdf7851a3a..4fcdfa438574fac7de21c963f5bb173c69261210 100644
--- a/doc/SAVE.md
+++ b/doc/SAVE.md
@@ -36,14 +36,14 @@ for line in sys.stdin:
 If you have saved model files using Paddle's `save_inference_model` API, you can use Paddle Serving's` inference_model_to_serving` API to convert it into a model file that can be used for Paddle Serving.
 ```
 import paddle_serving_client.io as serving_io
-serving_io.inference_model_to_serving(dirname, model_filename=None, params_filename=None, serving_server="serving_server", serving_client="serving_client")
+serving_io.inference_model_to_serving(dirname, serving_server="serving_server", serving_client="serving_client", model_filename=None, params_filename=None )
 ```
 dirname (str) - Path of saved model files. Program file and parameter files are saved in this directory.
 
-model_filename (str, optional) - The name of file to load the inference program. If it is None, the default filename `__model__` will be used. Default: None.
-
-paras_filename (str, optional) - The name of file to load all parameters. It is only used for the case that all parameters were saved in a single binary file. If parameters were saved in separate files, set it as None. Default: None.
-
 serving_server (str, optional) - The path of model files and configuration files for server. Default: "serving_server".
 
 serving_client (str, optional) - The path of configuration files for client. Default: "serving_client".
+
+model_filename (str, optional) - The name of file to load the inference program. If it is None, the default filename `__model__` will be used. Default: None.
+
+paras_filename (str, optional) - The name of file to load all parameters. It is only used for the case that all parameters were saved in a single binary file. If parameters were saved in separate files, set it as None. Default: None.
diff --git a/doc/SAVE_CN.md b/doc/SAVE_CN.md
index de519da8f9044401e44278e08be89422c19fb18b..3ca715c024a38b6fdce5c973844e7d023eebffcc 100644
--- a/doc/SAVE_CN.md
+++ b/doc/SAVE_CN.md
@@ -37,14 +37,14 @@ for line in sys.stdin:
 如果已使用Paddle 的`save_inference_model`接口保存出预测要使用的模型，则可以通过Paddle Serving的`inference_model_to_serving`接口转换成可用于Paddle Serving的模型文件。
 ```
 import paddle_serving_client.io as serving_io
-serving_io.inference_model_to_serving(dirname, model_filename=None, params_filename=None, serving_server="serving_server", serving_client="serving_client")
+serving_io.inference_model_to_serving(dirname, serving_server="serving_server", serving_client="serving_client",  model_filename=None, params_filename=None)
 ```
 dirname (str) – 需要转换的模型文件存储路径，Program结构文件和参数文件均保存在此目录。
 
-model_filename (str，可选) – 存储需要转换的模型Inference Program结构的文件名称。如果设置为None，则使用 `__model__` 作为默认的文件名。默认值为None。
-
-params_filename (str，可选) – 存储需要转换的模型所有参数的文件名称。当且仅当所有模型参数被保存在一个单独的二进制文件中，它才需要被指定。如果模型参数是存储在各自分离的文件中，设置它的值为None。默认值为None。
-
 serving_server (str, 可选) - 转换后的模型文件和配置文件的存储路径。默认值为serving_server。
 
 serving_client (str, 可选) - 转换后的客户端配置文件存储路径。默认值为serving_client。
+
+model_filename (str，可选) – 存储需要转换的模型Inference Program结构的文件名称。如果设置为None，则使用 `__model__` 作为默认的文件名。默认值为None。
+
+params_filename (str，可选) – 存储需要转换的模型所有参数的文件名称。当且仅当所有模型参数被保存在一个单独的二进制文件中，它才需要被指定。如果模型参数是存储在各自分离的文件中，设置它的值为None。默认值为None。
diff --git a/python/paddle_serving_client/io/__init__.py b/python/paddle_serving_client/io/__init__.py
index 4f174866e5521577ba35f39216f7dd0793879a6c..93ae37056320c2c7d779c5bbfc4d004a1be4f639 100644
--- a/python/paddle_serving_client/io/__init__.py
+++ b/python/paddle_serving_client/io/__init__.py
@@ -104,10 +104,10 @@ def save_model(server_model_folder,
 
 
 def inference_model_to_serving(dirname,
-                               model_filename=None,
-                               params_filename=None,
                                serving_server="serving_server",
-                               serving_client="serving_client"):
+                               serving_client="serving_client",
+                               model_filename=None,
+                               params_filename=None):
     place = fluid.CPUPlace()
     exe = fluid.Executor(place)
     inference_program, feed_target_names, fetch_targets = \