diff --git a/pay/alipay.go b/pay/alipay.go
index d37a8ea..de70fe1 100644
--- a/pay/alipay.go
+++ b/pay/alipay.go
@@ -103,6 +103,7 @@ func CreditagreementSign(args map[string]string) (string, error) {
 		bz.Set("out_agreement_no", args["out_agreement_no"])
 		bz.Set("zm_service_id", args["zm_service_id"])
 		bz.Set("category_id", args["category_id"])
+		bz.Set("return_back_link", args["return_back_link"])
 	})
 
 	aliPsp := ""