diff --git a/zh-cn/application-dev/media/audio-capturer.md b/zh-cn/application-dev/media/audio-capturer.md
index 577d93292181bcd30a2a0c964c8bcb566d69fe26..bd4b85955dc96e626702d1e045636125e77d4321 100644
--- a/zh-cn/application-dev/media/audio-capturer.md
+++ b/zh-cn/application-dev/media/audio-capturer.md
@@ -72,7 +72,7 @@ AudioCapturer提供了用于获取原始音频文件的方法。开发者可以
      }
      await audioCapturer.start();
 
-     let state = audioCapturer.state;
+     state = audioCapturer.state;
      if (state == audio.AudioState.STATE_RUNNING) {
        console.info('AudioRecLog: Capturer started');
      } else {
@@ -112,6 +112,7 @@ AudioCapturer提供了用于获取原始音频文件的方法。开发者可以
       
    let numBuffersToCapture = 150; // 循环写入150次
    while (numBuffersToCapture) {
+     let bufferSize = await audioCapturer.getBuffersize();
      let buffer = await audioCapturer.read(bufferSize, true);
      if (typeof(buffer) == undefined) {
        console.info('AudioRecLog: read buffer failed');