diff --git a/qq/Recharge.php b/qq/Recharge.php
index f98331d..8892b3e 100644
--- a/qq/Recharge.php
+++ b/qq/Recharge.php
@@ -48,9 +48,12 @@ class Recharge extends SmallProgram
 			}
 			$return = [];
 			$_sign = Help::sign($data, $config->getKey(), $config->getSignType());
-			if (!isset($sign) || $sign != $_sign) {
+			if (!isset($sign)) {
 				$return['code'] = -1;
-				$return['message'] = $data['retmsg'] ?? '返回数据签名验证失败';
+				$return['message'] = '返回数据签名验证失败';
+			} elseif (!isset($sign) || $sign != $_sign) {
+				$return['code'] = -1;
+				$return['message'] = $data['retmsg'] ?? '预支付系统错误!';
 			} else {
 				$return['code'] = 0;
 				$return['data'] = $data;