diff --git a/app/Controller/PaymentController.php b/app/Controller/PaymentController.php
index a411185..f8d36fd 100644
--- a/app/Controller/PaymentController.php
+++ b/app/Controller/PaymentController.php
@@ -39,6 +39,7 @@ class PaymentController extends BaseController
             'openid' => $data['openid'],
         ]);
 
+        // 返回支付参数给前端
         $parameters = [
             'appId' => $result['appid'],
             'timeStamp' => '' . time() . '',
@@ -47,36 +48,11 @@ class PaymentController extends BaseController
             'signType' => 'MD5'
         ];
 
-        //签名步骤一：按字典序排序参数
-        ksort($parameters);
-        $string = $this->formatBizQueryParaMap($parameters, false);
-        //签名步骤二：在string后加入KEY
-        $string = $string . "&key=" . $config['key'];
-        //签名步骤三：MD5加密
-        $string = md5($string);
-        //签名步骤四：所有字符转为大写
-        $parameters['paySign'] = strtoupper($string);
+        $parameters['paySign'] = $this->signture($parameters, $config['key']);
 
         return $this->success($parameters);
     }
 
-    ///作用：格式化参数，签名过程需要使用
-    private function formatBizQueryParaMap($paraMap, $urlencode) {
-        $buff = "";
-        ksort($paraMap);
-        foreach ($paraMap as $k => $v) {
-            if ($urlencode) {
-                $v = urlencode($v);
-            }
-            $buff .= $k . "=" . $v . "&";
-        }
-        $reqPar = null;
-        if (strlen($buff) > 0) {
-            $reqPar = substr($buff, 0, strlen($buff) - 1);
-        }
-        return $reqPar;
-    }
-
     public function wxminiPayOffline(WxminiPayRequest $request){
 
         $data = $request->validated();
@@ -104,10 +80,57 @@ class PaymentController extends BaseController
             'openid' => $data['openid'],
         ]);
 
-        $result['sign_type'] = 'MD5';
-        $result['timestamp'] = time();
+        // 返回支付参数给前端
+        $parameters = [
+            'appId' => $result['appid'],
+            'timeStamp' => '' . time() . '',
+            'nonceStr' => uniqid(),
+            'package' => 'prepay_id=' . $result['prepay_id'],
+            'signType' => 'MD5'
+        ];
+
+        $parameters['paySign'] = $this->signture($parameters, $config['key']);
+
+        return $this->success($parameters);
+    }
+
+    /**
+     * 支付参数加签
+     * @param $parameters
+     * @param $key
+     * @return string
+     */
+    private function signture($parameters, $key)
+    {
+        // 按字典序排序参数
+        ksort($parameters);
+
+        // http_query
+        $queryParams = $this->http_query($parameters);
+
+        // 加入KEY
+        $queryParams = $queryParams . "&key=" . $key;
+
+        // MD5加密
+        $queryParams = md5($queryParams);
+
+        // 字符转为大写
+        return strtoupper($queryParams);
+    }
+
+    /**
+     * 参数转为http query字串
+     * @param $parameters
+     * @return string
+     */
+    private function http_query($parameters) {
+
+        $http_query = [];
+        foreach ($parameters as $key => $value) {
+            $http_query[] = $key.'='.$value;
+        }
 
-        return $this->success($result);
+        return implode('&', $http_query);
     }
 
 }
\ No newline at end of file