diff --git a/demos/text_to_speech/README.md b/demos/text_to_speech/README.md
index a1198b4b..f25dc606 100644
--- a/demos/text_to_speech/README.md
+++ b/demos/text_to_speech/README.md
@@ -17,29 +17,29 @@ pip install paddlespeech
 Input of this demo should be a text of the specific language that can be passed via argument.
 ### 3. Usage
 - Command Line (Recommended)
-	- Chinese
-	```bash
-	paddlespeech tts --input "你好，欢迎使用百度飞桨深度学习框架！"
-	```
-	The default acoustic model is `Fastspeech2`, and the default vocoder is `Parallel WaveGAN`.
-  	- Chinese, use `SpeedySpeech` as acoustic model
-	```bash
-	paddlespeech tts --am speedyspeech_csmsc --input "你好，欢迎使用百度飞桨深度学习框架！"
-	```
-	- Chinese, multi speaker
-	```bash
-	paddlespeech tts --am fastspeech2_aishell3 --voc pwgan_aishell3 --input "你好，欢迎使用百度飞桨深度学习框架！" --spk_id 0
-	```
-	You can change `spk_id` here.
+    - Chinese
+    ```bash
+    paddlespeech tts --input "你好，欢迎使用百度飞桨深度学习框架！"
+    ```
+    The default acoustic model is `Fastspeech2`, and the default vocoder is `Parallel WaveGAN`.
+      - Chinese, use `SpeedySpeech` as acoustic model
+    ```bash
+    paddlespeech tts --am speedyspeech_csmsc --input "你好，欢迎使用百度飞桨深度学习框架！"
+    ```
+    - Chinese, multi speaker
+    ```bash
+    paddlespeech tts --am fastspeech2_aishell3 --voc pwgan_aishell3 --input "你好，欢迎使用百度飞桨深度学习框架！" --spk_id 0
+    ```
+    You can change `spk_id` here.
      - English
-	```bash
-	paddlespeech tts --am fastspeech2_ljspeech --voc pwgan_ljspeech --lang en --input "hello world"
-	```
-	- English, multi speaker
-	```bash
-	paddlespeech tts --am fastspeech2_vctk --voc pwgan_vctk --input "hello, boys" --lang en --spk_id 0
-    	```
-     You can change `spk_id` here.
+    ```bash
+    paddlespeech tts --am fastspeech2_ljspeech --voc pwgan_ljspeech --lang en --input "hello world"
+    ```
+    - English, multi speaker
+    ```bash
+        paddlespeech tts --am fastspeech2_vctk --voc pwgan_vctk --input "hello, boys" --lang en --spk_id 0
+    ```
+    You can change `spk_id` here.
  Usage:
   
   ```bash