diff --git a/app/src/main/java/com/nova/brain/glass/ui/InspectionActivity.kt b/app/src/main/java/com/nova/brain/glass/ui/InspectionActivity.kt
index 8b2ceae..589bb28 100644
--- a/app/src/main/java/com/nova/brain/glass/ui/InspectionActivity.kt
+++ b/app/src/main/java/com/nova/brain/glass/ui/InspectionActivity.kt
@@ -42,6 +42,7 @@ class InspectionActivity :
     private var currentZoomLevel = 1
     private var maxZoomLevel = 1
     private var previewStartAttempted = false
+    private var previewSurface: Surface? = null
 
     private val listener = object : OfflineCmdListener {
         override fun onOfflineCmd(cmd: String) {
@@ -61,6 +62,7 @@ class InspectionActivity :
     private val cameraSurfaceCallbackId = UUID.randomUUID().toString()
     private val cameraSurfaceCallback = object : ICameraSurfaceCallback.Stub() {
         override fun onCameraOpened(width: Int, height: Int) {
+            LogHelper.d("Inspection preview onCameraOpened: ${width}x$height")
             isPreviewActive = true
             currentZoomLevel = GlassMediaServiceHelper.getZoomLevel().coerceAtLeast(1)
             maxZoomLevel = GlassMediaServiceHelper.getMaxZoomLevel().coerceAtLeast(1)
@@ -73,6 +75,7 @@ class InspectionActivity :
         }
 
         override fun onCameraClosed() {
+            LogHelper.d("Inspection preview onCameraClosed")
             isPreviewActive = false
             runOnUiThread {
                 binding.cameraPreviewContainer.visibility = View.GONE
@@ -81,6 +84,7 @@ class InspectionActivity :
         }
 
         override fun onError(code: Int, message: String?) {
+            LogHelper.d("Inspection preview onError: code=$code msg=$message")
             isPreviewActive = false
             runOnUiThread {
                 binding.cameraPreviewContainer.visibility = View.GONE
@@ -197,14 +201,20 @@ class InspectionActivity :
             return
         }
         val surfaceTexture = binding.cameraPreview.surfaceTexture ?: return
+        val width = binding.cameraPreview.width.coerceAtLeast(1)
+        val height = binding.cameraPreview.height.coerceAtLeast(1)
+        surfaceTexture.setDefaultBufferSize(width, height)
         previewStartAttempted = true
-        val surface = Surface(surfaceTexture)
-        LogHelper.d("Inspection startCameraPreview invoke startCameraShare")
+        previewSurface?.release()
+        previewSurface = Surface(surfaceTexture)
+        LogHelper.d("Inspection startCameraPreview invoke startCameraShare, buffer=${width}x$height")
         runCatching {
-            GlassMediaServiceHelper.startCameraShare(surface, cameraSurfaceCallback)
+            GlassMediaServiceHelper.startCameraShare(previewSurface!!, cameraSurfaceCallback)
         }.onFailure {
             isPreviewRequested = false
             previewStartAttempted = false
+            previewSurface?.release()
+            previewSurface = null
             binding.cameraPreviewContainer.visibility = View.GONE
             binding.zoomText.visibility = View.GONE
             binding.hint.text = "相机预览启动失败，请重试"
@@ -223,6 +233,8 @@ class InspectionActivity :
         }.onFailure {
             LogHelper.e("Inspection stopCameraPreview failed: ${it.message}", it)
         }
+        previewSurface?.release()
+        previewSurface = null
         binding.cameraPreviewContainer.visibility = View.GONE
         binding.zoomText.visibility = View.GONE
     }