diff --git a/metagpt/tools/azure_tts.py b/metagpt/tools/azure_tts.py
index 0dc16d516..6864faf10 100644
--- a/metagpt/tools/azure_tts.py
+++ b/metagpt/tools/azure_tts.py
@@ -7,18 +7,15 @@
 @Desc    : azure TTS OAS3 api, which provides text-to-speech functionality
 """
 import asyncio
+import base64
 from pathlib import Path
 from uuid import uuid4
-import base64
-import sys
+
 import aiofiles
+from azure.cognitiveservices.speech import AudioConfig, SpeechConfig, SpeechSynthesizer
 
 from metagpt.config import CONFIG, Config
-
-sys.path.append(str(Path(__file__).resolve().parent.parent.parent))  # fix-bug: No module named 'metagpt'
 from metagpt.logs import logger
-from aiofile import async_open
-from azure.cognitiveservices.speech import AudioConfig, SpeechConfig, SpeechSynthesizer
 
 
 class AzureTTS:
@@ -34,18 +31,17 @@ class AzureTTS:
 
     # 参数参考：https://learn.microsoft.com/zh-cn/azure/cognitive-services/speech-service/language-support?tabs=tts#voice-styles-and-roles
     async def synthesize_speech(self, lang, voice, text, output_file):
-        speech_config = SpeechConfig(
-            subscription=self.subscription_key, region=self.region)
+        speech_config = SpeechConfig(subscription=self.subscription_key, region=self.region)
         speech_config.speech_synthesis_voice_name = voice
         audio_config = AudioConfig(filename=output_file)
-        synthesizer = SpeechSynthesizer(
-            speech_config=speech_config,
-            audio_config=audio_config)
+        synthesizer = SpeechSynthesizer(speech_config=speech_config, audio_config=audio_config)
 
         # More detail: https://learn.microsoft.com/en-us/azure/ai-services/speech-service/speech-synthesis-markup-voice
-        ssml_string = "<speak version='1.0' xmlns='http://www.w3.org/2001/10/synthesis' " \
-                      f"xml:lang='{lang}' xmlns:mstts='http://www.w3.org/2001/mstts'>" \
-                      f"<voice name='{voice}'>{text}</voice></speak>"
+        ssml_string = (
+            "<speak version='1.0' xmlns='http://www.w3.org/2001/10/synthesis' "
+            f"xml:lang='{lang}' xmlns:mstts='http://www.w3.org/2001/mstts'>"
+            f"<voice name='{voice}'>{text}</voice></speak>"
+        )
 
         return synthesizer.speak_ssml_async(ssml_string).get()
 
@@ -100,7 +96,7 @@ async def oas3_azsure_tts(text, lang="", voice="", style="", role="", subscripti
         await tts.synthesize_speech(lang=lang, voice=voice, text=xml_value, output_file=str(filename))
         async with aiofiles.open(filename, mode="rb") as reader:
             data = await reader.read()
-            base64_string = base64.b64encode(data).decode('utf-8')
+            base64_string = base64.b64encode(data).decode("utf-8")
         filename.unlink()
     except Exception as e:
         logger.error(f"text:{text}, error:{e}")