diff --git a/once.go b/once.go
index 9a83c50..5acb887 100644
--- a/once.go
+++ b/once.go
@@ -38,6 +38,8 @@ type OnceWorkerResp struct {
 	AttachData interface{}
 }
 
+type OnceTaskType string
+
 // 需要考虑执行失败重新放入队列的情况
 type Callback interface {
 	// 任务执行
@@ -91,7 +93,7 @@ func InitOnce(ctx context.Context, re redis.UniversalClient, keyPrefix string, c
 // @param uniTaskId string 任务唯一标识
 // @param delayTime time.Duration 延迟时间
 // @param attachData interface{} 附加数据
-func (w *Once) Save(taskType string, taskId string, delayTime time.Duration, attachData interface{}) error {
+func (w *Once) Save(taskType OnceTaskType, taskId string, delayTime time.Duration, attachData interface{}) error {
 	if delayTime.Abs() != delayTime {
 		return fmt.Errorf("时间间隔不能为负数")
 	}
@@ -123,7 +125,7 @@ func (w *Once) Save(taskType string, taskId string, delayTime time.Duration, att
 }
 
 // 添加任务(不覆盖)
-func (l *Once) Create(taskType string, taskId string, delayTime time.Duration, attachData interface{}) error {
+func (l *Once) Create(taskType OnceTaskType, taskId string, delayTime time.Duration, attachData interface{}) error {
 	redisKey := fmt.Sprintf("%s[:]%s", taskType, taskId)
 	// 判断有序集合Key是否存在，存在则报错，不存在则写入
 	if l.redis.ZScore(l.ctx, l.zsetKey, redisKey).Val() == 0 {
@@ -152,7 +154,7 @@ func (l *Once) Create(taskType string, taskId string, delayTime time.Duration, a
 }
 
 // 删除任务
-func (w *Once) Delete(taskType string, taskId string) error {
+func (w *Once) Delete(taskType OnceTaskType, taskId string) error {
 	redisKey := fmt.Sprintf("%s[:]%s", taskType, taskId)
 
 	w.redis.Del(w.ctx, redisKey).Result()
@@ -163,7 +165,7 @@ func (w *Once) Delete(taskType string, taskId string) error {
 }
 
 // 获取任务
-func (l *Once) Get(taskType string, taskId string) {
+func (l *Once) Get(taskType OnceTaskType, taskId string) {
 	//
 }
 
@@ -253,6 +255,6 @@ func (l *Once) doTask(ctx context.Context, key string) {
 		}
 		ed.Data = resp.AttachData
 		l.logger.Infof(ctx, "任务重新放入队列:%s", key)
-		l.Create(s[0], s[1], ed.Delay, ed.Data)
+		l.Create(OnceTaskType(s[0]), s[1], ed.Delay, ed.Data)
 	}
 }