diff --git a/WeChat/Pay.php b/WeChat/Pay.php
index 260e8be..ea2aeb5 100644
--- a/WeChat/Pay.php
+++ b/WeChat/Pay.php
@@ -196,7 +196,7 @@ class Pay
     public function createTransfers(array $options)
     {
         $url = 'https://api.mch.weixin.qq.com/mmpaymkttransfers/promotion/transfers';
-        return $this->callPostApi($url, $options, true);
+        return $this->callPostApi($url, $options, true, false);
     }
 
     /**
@@ -208,7 +208,7 @@ class Pay
     public function queryTransfers($partner_trade_no)
     {
         $url = 'https://api.mch.weixin.qq.com/mmpaymkttransfers/gettransferinfo';
-        return $this->callPostApi($url, ['partner_trade_no' => $partner_trade_no], true);
+        return $this->callPostApi($url, ['partner_trade_no' => $partner_trade_no], true, false);
     }
 
     /**
@@ -248,10 +248,11 @@ class Pay
      * @param string $url 请求
      * @param array $data 接口参数
      * @param bool $isCert 是否需要使用双向证书
+     * @param bool $needSignType 是否需要传签名类型参数
      * @return array
      * @throws InvalidResponseException
      */
-    public function callPostApi($url, array $data, $isCert = false)
+    public function callPostApi($url, array $data, $isCert = false, $needSignType = true)
     {
         $option = [];
         if ($isCert) {
@@ -264,7 +265,9 @@ class Pay
             $option['ssl_key'] = $this->config->get('ssl_key');
         }
         $params = $this->params->merge($data);
-        $params['sign_type'] = 'HMAC-SHA256';
+        if ($needSignType) {
+            $params['sign_type'] = 'HMAC-SHA256';
+        }
         $params['sign'] = $this->getPaySign($params);
         $result = Tools::xml2arr(Tools::post($url, Tools::arr2xml($params), $option));
         if ($result['return_code'] !== 'SUCCESS') {