diff --git a/alert/dispatch/dispatch.go b/alert/dispatch/dispatch.go
index ed97861f8..deb5e1914 100644
--- a/alert/dispatch/dispatch.go
+++ b/alert/dispatch/dispatch.go
@@ -183,7 +183,10 @@ func (e *Dispatch) Send(rule *models.AlertRule, event *models.AlertCurEvent, not
 			logger.Warningf("no sender for channel: %s", channel)
 			continue
 		}
-		logger.Debugf("send event: %s, channel: %s, uids: %+v", event.Hash, channel, ctx.Users)
+		logger.Debugf("send event: %s, channel: %s", event.Hash, channel)
+		for i := 0; i < len(ctx.Users); i++ {
+			logger.Debug("send event to user: ", ctx.Users[i])
+		}
 		s.Send(ctx)
 	}
 
diff --git a/models/user.go b/models/user.go
index 4f25e86ed..4d1e0ce3f 100644
--- a/models/user.go
+++ b/models/user.go
@@ -57,6 +57,15 @@ func (u *User) TableName() string {
 	return "users"
 }
 
+func (u *User) String() string {
+	bs, err := u.Contacts.MarshalJSON()
+	if err != nil {
+		return err.Error()
+	}
+
+	return fmt.Sprintf("<id:%d username:%s nickname:%s email:%s phone:%s contacts:%s>", u.Id, u.Username, u.Nickname, u.Email, u.Phone, string(bs))
+}
+
 func (u *User) IsAdmin() bool {
 	for i := 0; i < len(u.RolesLst); i++ {
 		if u.RolesLst[i] == AdminRole {