diff --git a/README.md b/README.md
index 2a7b735d..4c4fe340 100644
--- a/README.md
+++ b/README.md
@@ -80,7 +80,7 @@ export PYTHONPATH=third_party/Matcha-TTS
 
 ``` python
 from cosyvoice.cli.cosyvoice import CosyVoice
-from cosyvoice.utils.file_utils import load_wav,speed_change
+from cosyvoice.utils.file_utils import load_wav
 import torchaudio
 
 cosyvoice = CosyVoice('pretrained_models/CosyVoice-300M-SFT')
@@ -89,10 +89,6 @@ print(cosyvoice.list_avaliable_spks())
 output = cosyvoice.inference_sft('你好，我是通义生成式语音大模型，请问有什么可以帮您的吗？', '中文女')
 torchaudio.save('sft.wav', output['tts_speech'], 22050)
 
-# if you wanna change the speed
-audio,sample_rate = speed_change(output["tts_speech"],22050,"1.6")
-torchaudio.save('sft_speed_1.6.wav',audio, 22050)
-
 cosyvoice = CosyVoice('pretrained_models/CosyVoice-300M')
 # zero_shot usage, <|zh|><|en|><|jp|><|yue|><|ko|> for Chinese/English/Japanese/Cantonese/Korean
 prompt_speech_16k = load_wav('zero_shot_prompt.wav', 16000)