diff --git a/backend/src/modules/tts/tts.controller.ts b/backend/src/modules/tts/tts.controller.ts
index 5834de2..2a5ea62 100644
--- a/backend/src/modules/tts/tts.controller.ts
+++ b/backend/src/modules/tts/tts.controller.ts
@@ -47,6 +47,14 @@ export class TtsController {
     const dest = path.join(uploadDir, file.filename + ext)
     fs.renameSync(file.path, dest)
 
+    // 拒绝损坏/空音频文件，避免 whisper 调用 ffmpeg 解码失败刷错误日志
+    const stat = fs.statSync(dest)
+    if (!stat.size || stat.size < 500) {
+      this.logger.warn(`ASR: empty audio upload (size=${stat.size}), ext=${ext}`)
+      try { fs.unlinkSync(dest) } catch {}
+      return { text: '' }
+    }
+
     let wavPath = dest
     if (ext.toLowerCase() !== '.wav') {
       const potentialWav = dest.replace(/\.[^.]+$/, '.wav')
diff --git a/zhiyin-app/src/manifest.json b/zhiyin-app/src/manifest.json
index 629c1ba..d30c6db 100644
--- a/zhiyin-app/src/manifest.json
+++ b/zhiyin-app/src/manifest.json
@@ -16,6 +16,11 @@
       "urlCheck": false,
       "__usePrivacyCheck__": true
     },
-    "usingComponents": true
+    "usingComponents": true,
+    "permission": {
+      "scope.record": {
+        "desc": "用于语音输入回答面试问题"
+      }
+    }
   }
 }
diff --git a/zhiyin-app/src/pages/interview/interview.vue b/zhiyin-app/src/pages/interview/interview.vue
index facac75..d836cce 100644
--- a/zhiyin-app/src/pages/interview/interview.vue
+++ b/zhiyin-app/src/pages/interview/interview.vue
@@ -146,10 +146,52 @@ const aiAmplitudeData = ref([])
 const isSpeaking = ref(false)
 const dhRef = ref(null)
 const isRecording = ref(false)
-let recorder = null
+  let recorder = null
 
-let timerSeconds = 0
-let timerInterval = null
+// 录音初始化（一次性创建 recorder 并设置事件）
+function initRecorder() {
+  // #ifdef MP-WEIXIN
+  if (recorder) return // 已初始化
+  recorder = uni.getRecorderManager()
+  recorder.onStart(() => {
+    console.log('[Recorder] start recording')
+  })
+  recorder.onError((err) => {
+    console.error('[Recorder] error:', err)
+    isRecording.value = false
+    uni.showToast({ title: '录音失败，请重试', icon: 'none' })
+  })
+  recorder.onStop(async (res) => {
+    isRecording.value = false
+    console.log('[Recorder] stop, tempFilePath:', res.tempFilePath)
+    if (!res.tempFilePath) {
+      uni.showToast({ title: '录音文件为空', icon: 'none' })
+      return
+    }
+    try {
+      const uploadRes = await uni.uploadFile({
+        url: api(API_ENDPOINTS.TTS.ASR),
+        filePath: res.tempFilePath,
+        name: 'audio',
+        header: { 'Authorization': `Bearer ${token()}` },
+      })
+      if (uploadRes.statusCode === 200 && uploadRes.data) {
+        const data = typeof uploadRes.data === 'string' ? JSON.parse(uploadRes.data) : uploadRes.data
+        if (data.text) {
+          inputText.value = data.text
+          uni.vibrateShort({ type: 'light' })
+          return
+        }
+      } else if (checkAuth(uploadRes)) {
+        return
+      }
+    } catch (e) {
+      console.error('[ASR] upload error:', e?.message || e)
+    }
+    uni.showToast({ title: '语音识别失败，请手动输入', icon: 'none' })
+  })
+  // #endif
+}
 
 let MAX_QUESTIONS = 10
 const progressPercent = computed(() => Math.min((answeredCount.value / MAX_QUESTIONS) * 100, 100))
@@ -190,9 +232,9 @@ const selectPosition = (pos) => {
 }
 
 onMounted(() => {
+  initRecorder()
   timerInterval = setInterval(() => timerSeconds++, 1000)
   if (!position.value) {
-    // 未传入岗位，展示选择弹窗（无论是否登录）
     loadPositions()
     showPositionPicker.value = true
   } else if (token()) {
@@ -356,43 +398,45 @@ const confirmExit = () => {
 function startRecord() {
   if (aiLoading.value || isComplete.value) return
   // #ifdef MP-WEIXIN
-  isRecording.value = true
-  recorder = uni.getRecorderManager()
-  recorder.onStart(() => {})
-  recorder.onError(() => { isRecording.value = false; uni.showToast({ title: '录音失败', icon: 'none' }) })
-  recorder.onStop(async (res) => {
-    if (!res.tempFilePath) return
-    const audioPath = res.tempFilePath
-    try {
-      const uploadRes = await uni.uploadFile({
-        url: api(API_ENDPOINTS.TTS.ASR),
-        filePath: audioPath,
-        name: 'audio',
-        header: { 'Authorization': `Bearer ${token()}` },
+  if (isRecording.value) return
+  // 先确保已获得 scope.record 授权，避免没权限时产生全 0 的 corrupted 音频
+  uni.authorize({
+    scope: 'scope.record',
+    success: () => doStartRecorder(),
+    fail: () => {
+      uni.showModal({
+        title: '需要录音权限',
+        content: '请在「设置」中开启「麦克风」权限后再使用语音输入',
+        confirmText: '去设置',
+        success: (r) => { if (r.confirm) uni.openSetting({}) },
       })
-      if (uploadRes.statusCode === 200 && uploadRes.data) {
-        const data = typeof uploadRes.data === 'string' ? JSON.parse(uploadRes.data) : uploadRes.data
-        if (data.text) {
-          inputText.value = data.text
-          uni.vibrateShort({ type: 'light' })
-          return
-        }
-      } else if (checkAuth(uploadRes)) {
-        return
-      }
-    } catch (e) {
-      console.error('[ASR] upload error:', e?.message || e)
-    }
-    uni.showToast({ title: '语音识别失败，请手动输入', icon: 'none' })
+    },
   })
-  recorder.start({ format: 'aac', sampleRate: 22050, numberOfChannels: 1, encodeBitRate: 16000 })
-  uni.vibrateShort({ type: 'medium' })
   // #endif
   // #ifndef MP-WEIXIN
   uni.showToast({ title: '语音输入仅支持小程序', icon: 'none' })
   // #endif
 }
 
+// #ifdef MP-WEIXIN
+function doStartRecorder() {
+  isRecording.value = true
+  if (!recorder) initRecorder()
+  if (!recorder) {
+    isRecording.value = false
+    uni.showToast({ title: '录音初始化失败', icon: 'none' })
+    return
+  }
+  recorder.start({
+    format: 'wav',
+    sampleRate: 16000,
+    numberOfChannels: 1,
+    encodeBitRate: 128000,
+  })
+  uni.vibrateShort({ type: 'medium' })
+}
+// #endif
+
 function stopRecord() {
   if (!recorder || !isRecording.value) return
   isRecording.value = false