diff --git a/example/app/mail.go b/example/app/mail.go
index 3066e9e..91d1d10 100644
--- a/example/app/mail.go
+++ b/example/app/mail.go
@@ -3,6 +3,7 @@ package app
 import (
 	. "code.hoteas.com/golang/hotime"
 	. "code.hoteas.com/golang/hotime/common"
+	"time"
 )
 
 var MailCtr = Ctr{
@@ -33,6 +34,7 @@ var MailCtr = Ctr{
 		}
 
 		data := Map{
+			"sn":   Md5(ObjToStr(time.Now().UnixNano()) + ObjToStr(RandX(10000, 100000))),
 			"name": name, "title": title, "phone": phone, "content": content, "type": tp, "show": show,
 			"modify_time[#]": "NOW()", "create_time[#]": "NOW()",
 		}