diff --git a/src/renderer/src/components/CameraCapture.vue b/src/renderer/src/components/CameraCapture.vue
index c173567..3165284 100644
--- a/src/renderer/src/components/CameraCapture.vue
+++ b/src/renderer/src/components/CameraCapture.vue
@@ -18,6 +18,10 @@ const capturedDataUrl = ref('')
 const starting = ref(false)
 const errorMessage = ref('')
 
+// 真机实测确认的后置摄像头（朝外拍摄那颗）标签是 "Hy-8M(8079)-Camera"，
+// 用型号里的数字串匹配，不依赖完整标签文案（避免语言环境/固件版本差异导致匹配不上）
+const REAR_CAMERA_LABEL_HINT = '8079'
+
 let stream: MediaStream | null = null
 
 function stopStream(): void {
@@ -58,6 +62,10 @@ async function refreshDevices(): Promise<void> {
   }
 }
 
+function findRearCamera(): MediaDeviceInfo | undefined {
+  return devices.value.find((d) => d.label.includes(REAR_CAMERA_LABEL_HINT))
+}
+
 async function switchDevice(deviceId: string): Promise<void> {
   selectedDeviceId.value = deviceId
   emit('deviceChange', deviceId)
@@ -109,8 +117,16 @@ watch(
     if (val) {
       capturedDataUrl.value = ''
       selectedDeviceId.value = props.initialDeviceId
-      await refreshDevices()
+      // 摄像头 label 在拿到权限前是空的（浏览器隐私限制），没法在这一步就按标签
+      // 找后置摄像头，先随便开一个拿到权限；startStream 成功后 devices 里才有真实 label。
       await startStream(selectedDeviceId.value)
+      // 用户/配置没有指定具体摄像头时，权限到手后尝试切到确认过的后置摄像头
+      if (!props.initialDeviceId) {
+        const rear = findRearCamera()
+        if (rear && rear.deviceId !== selectedDeviceId.value) {
+          await switchDevice(rear.deviceId)
+        }
+      }
     } else {
       stopStream()
     }