diff --git a/config.yaml b/config.yaml
index 2d53042..ed183a5 100644
--- a/config.yaml
+++ b/config.yaml
@@ -32,3 +32,8 @@ disconnectAction:
   enabled: false
   thresholdMinutes: 5
   command: ""
+preview:
+  enabled: true
+  resolutions:
+    - 720
+    - 1080
diff --git a/config/dto.go b/config/dto.go
index f50a986..980a9c3 100644
--- a/config/dto.go
+++ b/config/dto.go
@@ -64,6 +64,11 @@ type DisconnectActionConfig struct {
 	Command          string `mapstructure:"command"`
 }
 
+type PreviewConfig struct {
+	Enabled     bool  `mapstructure:"enabled"`
+	Resolutions []int `mapstructure:"resolutions"`
+}
+
 type MainConfig struct {
 	Api              ApiConfig              `mapstructure:"api"`
 	Record           RecordConfig           `mapstructure:"record"`
@@ -71,4 +76,5 @@ type MainConfig struct {
 	FileName         FileNameConfig         `mapstructure:"fileName"`
 	Viid             ViidConfig             `mapstructure:"viid"`
 	DisconnectAction DisconnectActionConfig `mapstructure:"disconnectAction"`
+	Preview          PreviewConfig          `mapstructure:"preview"`
 }
diff --git a/main.go b/main.go
index 00a9858..24dc128 100644
--- a/main.go
+++ b/main.go
@@ -53,12 +53,16 @@ func startTask(device config.DeviceMapping, task dto.Task) {
 		zap.String("deviceNo", task.DeviceNo))
 
 	// 复制主文件用于异步生成预览，避免阻塞主上传流程
+	previewEnabled := config.Config.Preview.Enabled && len(config.Config.Preview.Resolutions) > 0
 	copyFile := strings.TrimSuffix(fo.URL, ".mp4") + "_copy.mp4"
-	copyErr := copyFileOnDisk(fo.URL, copyFile)
-	if copyErr != nil {
-		logger.Warn("复制文件用于预览失败",
-			zap.String("taskID", task.TaskID),
-			zap.Error(copyErr))
+	var copyErr error
+	if previewEnabled {
+		copyErr = copyFileOnDisk(fo.URL, copyFile)
+		if copyErr != nil {
+			logger.Warn("复制文件用于预览失败",
+				zap.String("taskID", task.TaskID),
+				zap.Error(copyErr))
+		}
 	}
 
 	err = api.UploadTaskFile(ctx, task, *fo)
@@ -69,7 +73,7 @@ func startTask(device config.DeviceMapping, task dto.Task) {
 			zap.String("deviceNo", task.DeviceNo),
 			zap.Error(err))
 		api.ReportTaskFailure(ctx, task.TaskID)
-		if copyErr == nil {
+		if previewEnabled && copyErr == nil {
 			os.Remove(copyFile)
 		}
 		return
@@ -81,7 +85,7 @@ func startTask(device config.DeviceMapping, task dto.Task) {
 			zap.String("taskID", task.TaskID),
 			zap.String("deviceNo", task.DeviceNo),
 			zap.Error(err))
-		if copyErr == nil {
+		if previewEnabled && copyErr == nil {
 			os.Remove(copyFile)
 		}
 		return
@@ -91,8 +95,8 @@ func startTask(device config.DeviceMapping, task dto.Task) {
 		zap.String("taskID", task.TaskID),
 		zap.String("deviceNo", task.DeviceNo))
 
-	// 异步：从副本压缩720p预览 → 上传 → 上报
-	if copyErr == nil {
+	// 异步：从副本压缩预览 → 上传 → 上报
+	if previewEnabled && copyErr == nil {
 		go uploadPreview(task.TaskID, copyFile)
 	}
 }
@@ -104,43 +108,35 @@ func uploadPreview(taskID string, copyFile string) {
 
 	baseName := strings.TrimSuffix(copyFile, "_copy.mp4")
 
-	type previewSpec struct {
-		resolution string
-		height     int
-	}
-	specs := []previewSpec{
-		{"720p", 720},
-		{"1080p", 1080},
-	}
-
-	for _, spec := range specs {
-		previewFile := fmt.Sprintf("%s_preview_%s.mp4", baseName, spec.resolution)
-		ok, _ := util.CompressVideo(ctx, copyFile, previewFile, spec.height)
+	for _, height := range config.Config.Preview.Resolutions {
+		resolution := fmt.Sprintf("%dp", height)
+		previewFile := fmt.Sprintf("%s_preview_%s.mp4", baseName, resolution)
+		ok, _ := util.CompressVideo(ctx, copyFile, previewFile, height)
 		if !ok {
 			logger.Error("生成预览文件失败",
 				zap.String("taskID", taskID),
-				zap.String("resolution", spec.resolution))
+				zap.String("resolution", resolution))
 			continue
 		}
 
-		err := api.UploadPreviewFile(ctx, taskID, previewFile, spec.resolution)
+		err := api.UploadPreviewFile(ctx, taskID, previewFile, resolution)
 		if err != nil {
 			logger.Error("上传预览文件失败",
 				zap.String("taskID", taskID),
-				zap.String("resolution", spec.resolution),
+				zap.String("resolution", resolution),
 				zap.Error(err))
 			os.Remove(previewFile)
 			continue
 		}
-		if !api.ReportPreviewSuccess(ctx, taskID, spec.resolution) {
+		if !api.ReportPreviewSuccess(ctx, taskID, resolution) {
 			logger.Error("上报预览成功失败",
 				zap.String("taskID", taskID),
-				zap.String("resolution", spec.resolution))
+				zap.String("resolution", resolution))
 			continue
 		}
 		logger.Info("预览上传成功",
 			zap.String("taskID", taskID),
-			zap.String("resolution", spec.resolution))
+			zap.String("resolution", resolution))
 	}
 
 	span.SetStatus(codes.Ok, "预览处理完成")