diff --git a/app/models/mailer.rb b/app/models/mailer.rb
index 737a1ea69..2e796b2bb 100644
--- a/app/models/mailer.rb
+++ b/app/models/mailer.rb
@@ -273,7 +273,7 @@ class Mailer < ActionMailer::Base
     @subject = " #{user.show_name}#{l(:label_day_mail_first)}#{total_count}#{l(:label_day_mail_last)}"
     mylogger.debug "Sent activity mail : #{user.mail} - #{has_content}"
     #有内容才发，没有不发
-    mail :to => user.mail,:subject => subject if has_content
+    mail :to => user.mail,:subject => @subject if has_content
   end
 
   # 作业截止时间邮件提醒