diff --git a/docs/WithFastapi.md b/docs/WithFastapi.md
index 9f4baa1..188b527 100644
--- a/docs/WithFastapi.md
+++ b/docs/WithFastapi.md
@@ -2,26 +2,41 @@
 
 We currently support fastapi in order to solve sub-path deploy issue.
 
-1. checkout to `subpath` branch
-
-``` sh
-git checkout subpath
-```
-
-
-2. merge lastest features (optional)
-
-``` sh
-git merge master
-```
-
-3. change CUSTOM_PATH setting in `config.py`
+1. change CUSTOM_PATH setting in `config.py`
 
 ``` sh
 nano config.py
 ```
 
-4. Go!
+2. Edit main.py
+
+```diff
+    auto_opentab_delay()
+    - demo.queue(concurrency_count=CONCURRENT_COUNT).launch(server_name="0.0.0.0", server_port=PORT, auth=AUTHENTICATION, favicon_path="docs/logo.png")
+    + demo.queue(concurrency_count=CONCURRENT_COUNT)
+
+    - # 如果需要在二级路径下运行
+    - # CUSTOM_PATH, = get_conf('CUSTOM_PATH')
+    - # if CUSTOM_PATH != "/": 
+    - #     from toolbox import run_gradio_in_subpath
+    - #     run_gradio_in_subpath(demo, auth=AUTHENTICATION, port=PORT, custom_path=CUSTOM_PATH)
+    - # else: 
+    - #     demo.launch(server_name="0.0.0.0", server_port=PORT, auth=AUTHENTICATION, favicon_path="docs/logo.png")
+
+    + 如果需要在二级路径下运行
+    + CUSTOM_PATH, = get_conf('CUSTOM_PATH')
+    + if CUSTOM_PATH != "/": 
+    +     from toolbox import run_gradio_in_subpath
+    +     run_gradio_in_subpath(demo, auth=AUTHENTICATION, port=PORT, custom_path=CUSTOM_PATH)
+    + else: 
+    +     demo.launch(server_name="0.0.0.0", server_port=PORT, auth=AUTHENTICATION, favicon_path="docs/logo.png")
+
+if __name__ == "__main__":
+    main()
+```
+
+
+3. Go!
 
 ``` sh
 python main.py