diff --git a/app/libs/aliyun_vod/service/video_manage.rb b/app/libs/aliyun_vod/service/video_manage.rb
index 40d0297b1..f3ec9d735 100644
--- a/app/libs/aliyun_vod/service/video_manage.rb
+++ b/app/libs/aliyun_vod/service/video_manage.rb
@@ -45,7 +45,7 @@ module AliyunVod::Service::VideoManage
       VideoId: video_id,
       StartTime: start_time,
       EndTime: end_time,
-      Interval: day
+      Interval: 'day'
     }.merge(base_params)
 
     result = request(:post, params)