diff --git a/wechat_ipad/client/message.py b/wechat_ipad/client/message.py
index 9e31c5a..c1b3109 100644
--- a/wechat_ipad/client/message.py
+++ b/wechat_ipad/client/message.py
@@ -332,21 +332,23 @@ class MessageMixin(WechatAPIClientBase):
                 voice_byte = f.read()
         else:
             raise ValueError("voice should be str, bytes, or path")
-
+        voice_type = 0
         # get voice duration and b64
         if format.lower() == "amr":
             audio = AudioSegment.from_file(BytesIO(voice_byte), format="amr")
             voice_base64 = base64.b64encode(voice_byte).decode()
         elif format.lower() == "wave":
-            audio = AudioSegment.from_file(BytesIO(voice_byte), format="wav").set_channels(1)
+            audio = AudioSegment.from_file(BytesIO(voice_byte), format="wav").set_channels(2)
             audio = audio.set_frame_rate(self._get_closest_frame_rate(audio.frame_rate))
             voice_base64 = base64.b64encode(
                 await pysilk.async_encode(audio.raw_data, sample_rate=audio.frame_rate)).decode()
+            voice_type = 4
         elif format.lower() == "mp3":
-            audio = AudioSegment.from_file(BytesIO(voice_byte), format="mp3").set_channels(1)
+            audio = AudioSegment.from_file(BytesIO(voice_byte), format="mp3").set_channels(2)
             audio = audio.set_frame_rate(self._get_closest_frame_rate(audio.frame_rate))
             voice_base64 = base64.b64encode(
                 await pysilk.async_encode(audio.raw_data, sample_rate=audio.frame_rate)).decode()
+            voice_type = 4
         else:
             raise ValueError("format must be one of amr, wav, mp3")
 
@@ -362,7 +364,7 @@ class MessageMixin(WechatAPIClientBase):
         # }
         async with aiohttp.ClientSession() as session:
             json_param = {"Wxid": self.wxid, "ToWxid": wxid, "Base64": voice_base64, "VoiceTime": duration,
-                          "Type": format_dict[format]}
+                          "Type": voice_type}
             response = await session.post(f'http://{self.ip}:{self.port}/api/Msg/SendVoice', json=json_param)
             json_resp = await response.json()