diff --git a/routers/user/auth.go b/routers/user/auth.go
index 550ca2c05..c49cfc671 100755
--- a/routers/user/auth.go
+++ b/routers/user/auth.go
@@ -1366,8 +1366,9 @@ func SignUpPost(ctx *context.Context, cpt *captcha.Captcha, form auth.RegisterFo
 	}
 	log.Trace("Account created: %s", u.Name, ctx.Data["MsgID"])
 
-	log.Info("enter here, and form.InvitaionCode =" + form.InvitaionCode)
-	if form.InvitaionCode != "" {
+	invitationCode := ctx.Query("invitation_code")
+	log.Info("enter here, and form.InvitaionCode =" + invitationCode)
+	if invitationCode != "" {
 		RegisteUserByInvitaionCode(form, u.ID)
 	}