diff --git a/lib/tasks/public_message.rake b/lib/tasks/public_message.rake
index 9d145df27..dddc330cd 100644
--- a/lib/tasks/public_message.rake
+++ b/lib/tasks/public_message.rake
@@ -66,7 +66,7 @@ namespace :sync do
       message_detail.update_columns(created_at: rand_created_on, updated_at: rand_created_on)
       if replies.present?
         replies.each do |reply|
-          reply_time = random_smaller_time(rand_created_on, start_time, end_time)
+          reply_time = smaller_time(rand_created_on, start_time, end_time)
           puts("666")
           reply_message = Message.create!(board_id: board_id.to_i, author_id: reply.user_id, parent_id: new_message.id, root_id: message_id)
           reply_message.update_columns(created_on: reply_time, updated_on: reply_time)
@@ -98,7 +98,7 @@ namespace :sync do
     end
 
     # 子评论的时间必须小于父评论
-    def random_smaller_time(parent_time, start_time, end_time)
+    def smaller_time(parent_time, start_time, end_time)
       large_time = random_time(start_time, end_time)
       while large_time > parent_time
         large_time = random_time(start_time, end_time)