diff --git a/internal/command/sync.go b/internal/command/sync.go
index 5986e66..f743df9 100644
--- a/internal/command/sync.go
+++ b/internal/command/sync.go
@@ -91,14 +91,18 @@ mode - 模式，支持三种: upload(备份本地文件到云盘),download(备
 	3. 使用命令行配置启动同步备份服务，将云盘目录 /sync_drive/我的文档 中的文件备份下载到本地目录 D:\tickstep\Documents\设计文档
 	aliyunpan sync start -ldir "D:\tickstep\Documents\设计文档" -pdir "/sync_drive/我的文档" -mode "download"
 
-	4. 使用命令行配置启动同步备份服务，将本地目录 D:\tickstep\Documents\设计文档 中的文件备份到云盘目录 /sync_drive/我的文档
+	4. 使用命令行配置启动同步备份服务，将云盘目录 /sync_drive/我的文档 和本地目录 D:\tickstep\Documents\设计文档 的文件进行双向同步
+       同时配置同步优先选项为本地文件优先
+	aliyunpan sync start -ldir "D:\tickstep\Documents\设计文档" -pdir "/sync_drive/我的文档" -mode "sync" -pri "local"
+
+	5. 使用命令行配置启动同步备份服务，将本地目录 D:\tickstep\Documents\设计文档 中的文件备份到云盘目录 /sync_drive/我的文档
        同时配置下载并发为2，上传并发为1，下载分片大小为256KB，上传分片大小为1MB
 	aliyunpan sync start -ldir "D:\tickstep\Documents\设计文档" -pdir "/sync_drive/我的文档" -mode "upload" -dp 2 -up 1 -dbs 256 -ubs 1024
     
-	5. 使用配置文件启动同步备份服务，使用配置文件可以支持同时启动多个备份任务。配置文件必须存在，否则启动失败。
+	6. 使用配置文件启动同步备份服务，使用配置文件可以支持同时启动多个备份任务。配置文件必须存在，否则启动失败。
 	aliyunpan sync start
 
-	6. 使用配置文件启动同步备份服务，并配置下载并发为2，上传并发为1，下载分片大小为256KB，上传分片大小为1MB
+	7. 使用配置文件启动同步备份服务，并配置下载并发为2，上传并发为1，下载分片大小为256KB，上传分片大小为1MB
 	aliyunpan sync start -dp 2 -up 1 -dbs 256 -ubs 1024
 
 `,
@@ -182,8 +186,17 @@ mode - 模式，支持三种: upload(备份本地文件到云盘),download(备
 						task.Name = path.Base(task.LocalFolderPath)
 						task.Id = utils.Md5Str(task.LocalFolderPath)
 					}
+					opt := c.String("pri")
+					var syncOpt syncdrive.SyncPriorityOption = syncdrive.SyncPriorityTimestampFirst
+					if opt == "local" {
+						syncOpt = syncdrive.SyncPriorityLocalFirst
+					} else if opt == "pan" {
+						syncOpt = syncdrive.SyncPriorityPanFirst
+					} else {
+						syncOpt = syncdrive.SyncPriorityTimestampFirst
+					}
 
-					RunSync(task, dp, up, downloadBlockSize, uploadBlockSize)
+					RunSync(task, dp, up, downloadBlockSize, uploadBlockSize, syncOpt)
 					return nil
 				},
 				Flags: []cli.Flag{
@@ -200,6 +213,11 @@ mode - 模式，支持三种: upload(备份本地文件到云盘),download(备
 						Usage: "备份模式, 支持三种: upload(备份本地文件到云盘),download(备份云盘文件到本地),sync(双向同步备份)",
 						Value: "upload",
 					},
+					cli.StringFlag{
+						Name:  "pri",
+						Usage: "优先级priority，只对双向同步备份模式有效。当网盘和本地存在同名文件，优先使用哪个，选项支持三种: time-时间优先，local-本地优先，pan-网盘优先",
+						Value: "time",
+					},
 					cli.IntFlag{
 						Name:  "dp",
 						Usage: "download parallel, 下载并发数量，即可以同时并发下载多少个文件。0代表跟从配置文件设置（取值范围:1 ~ 10）",
@@ -226,7 +244,8 @@ mode - 模式，支持三种: upload(备份本地文件到云盘),download(备
 	}
 }
 
-func RunSync(defaultTask *syncdrive.SyncTask, fileDownloadParallel, fileUploadParallel int, downloadBlockSize, uploadBlockSize int64) {
+func RunSync(defaultTask *syncdrive.SyncTask, fileDownloadParallel, fileUploadParallel int, downloadBlockSize, uploadBlockSize int64,
+	flag syncdrive.SyncPriorityOption) {
 	useInternalUrl := config.Config.TransferUrlType == 2
 	maxDownloadRate := config.Config.MaxDownloadRate
 	maxUploadRate := config.Config.MaxUploadRate
@@ -271,6 +290,7 @@ func RunSync(defaultTask *syncdrive.SyncTask, fileDownloadParallel, fileUploadPa
 		UseInternalUrl:        useInternalUrl,
 		MaxDownloadRate:       maxDownloadRate,
 		MaxUploadRate:         maxUploadRate,
+		SyncPriority:          flag,
 	}
 	syncMgr := syncdrive.NewSyncTaskManager(activeUser, activeUser.DriveList.GetFileDriveId(), panClient, syncFolderRootPath, option)
 	syncConfigFile := syncMgr.ConfigFilePath()
diff --git a/internal/syncdrive/file_action_task_mgr.go b/internal/syncdrive/file_action_task_mgr.go
index 654c58d..31c385d 100644
--- a/internal/syncdrive/file_action_task_mgr.go
+++ b/internal/syncdrive/file_action_task_mgr.go
@@ -572,7 +572,22 @@ func (f *FileActionTaskManager) doFileDiffRoutine(panFiles PanFileList, localFil
 			}
 			f.addToSyncDb(downloadPanFile)
 		} else if f.task.Mode == SyncTwoWay {
-			if localFile.UpdateTimeUnix() > panFile.UpdateTimeUnix() { // upload file
+			actFlag := "unknown"
+			if f.syncOption.SyncPriority == SyncPriorityTimestampFirst { // 时间优先
+				if localFile.UpdateTimeUnix() > panFile.UpdateTimeUnix() { // upload file
+					actFlag = "upload"
+				} else if localFile.UpdateTimeUnix() < panFile.UpdateTimeUnix() { // download file
+					actFlag = "download"
+				}
+			} else if f.syncOption.SyncPriority == SyncPriorityLocalFirst { // 本地文件优先
+				actFlag = "upload"
+			} else if f.syncOption.SyncPriority == SyncPriorityPanFirst { // 网盘文件优先
+				actFlag = "download"
+			} else {
+				// unsupported, do nothing
+			}
+
+			if actFlag == "upload" { // upload file
 				uploadLocalFile := &FileActionTask{
 					syncItem: &SyncFileItem{
 						Action:            SyncFileActionUpload,
@@ -589,7 +604,7 @@ func (f *FileActionTaskManager) doFileDiffRoutine(panFiles PanFileList, localFil
 					},
 				}
 				f.addToSyncDb(uploadLocalFile)
-			} else if localFile.UpdateTimeUnix() < panFile.UpdateTimeUnix() { // download file
+			} else if actFlag == "download" { // download file
 				downloadPanFile := &FileActionTask{
 					syncItem: &SyncFileItem{
 						Action:            SyncFileActionDownload,
diff --git a/internal/syncdrive/sync_db.go b/internal/syncdrive/sync_db.go
index d0cd231..2bb3c9e 100644
--- a/internal/syncdrive/sync_db.go
+++ b/internal/syncdrive/sync_db.go
@@ -11,6 +11,9 @@ import (
 )
 
 type (
+	// SyncPriorityOption 同步优先级选项
+	SyncPriorityOption string
+
 	// ScanStatus 扫描状态
 	ScanStatus string
 
@@ -179,6 +182,13 @@ const (
 	ScanStatusNormal ScanStatus = "normal"
 	// ScanStatusDiscard 已过期，已删除
 	ScanStatusDiscard ScanStatus = "discard"
+
+	// SyncPriorityTimestampFirst 最新时间优先
+	SyncPriorityTimestampFirst = "time_first"
+	// SyncPriorityLocalFirst 本地文件优先
+	SyncPriorityLocalFirst = "local_first"
+	// SyncPriorityPanFirst 网盘文件优先
+	SyncPriorityPanFirst = "pan_first"
 )
 
 var (
diff --git a/internal/syncdrive/sync_task.go b/internal/syncdrive/sync_task.go
index e16a8ed..c0ee396 100644
--- a/internal/syncdrive/sync_task.go
+++ b/internal/syncdrive/sync_task.go
@@ -84,6 +84,17 @@ func (t *SyncTask) String() string {
 		mode = "备份云盘文件（只下载）"
 	}
 	builder.WriteString("同步模式: " + mode + "\n")
+	if t.Mode == SyncTwoWay {
+		priority := "时间优先"
+		if t.syncOption.SyncPriority == SyncPriorityLocalFirst {
+			priority = "本地文件优先"
+		} else if t.syncOption.SyncPriority == SyncPriorityPanFirst {
+			priority = "网盘文件优先"
+		} else {
+			priority = "时间优先"
+		}
+		builder.WriteString("优先选项: " + priority + "\n")
+	}
 	builder.WriteString("本地目录: " + t.LocalFolderPath + "\n")
 	builder.WriteString("云盘目录: " + t.PanFolderPath + "\n")
 	return builder.String()
diff --git a/internal/syncdrive/sync_task_mgr.go b/internal/syncdrive/sync_task_mgr.go
index 9d44c44..b5048e7 100644
--- a/internal/syncdrive/sync_task_mgr.go
+++ b/internal/syncdrive/sync_task_mgr.go
@@ -23,6 +23,9 @@ type (
 
 		MaxDownloadRate int64 // 限制最大下载速度
 		MaxUploadRate   int64 // 限制最大上传速度
+
+		// 优先级选项
+		SyncPriority SyncPriorityOption
 	}
 
 	// SyncTaskManager 同步任务管理器