diff --git a/library/think/Request.php b/library/think/Request.php
index 6a6e6b50..1af874f9 100644
--- a/library/think/Request.php
+++ b/library/think/Request.php
@@ -121,6 +121,11 @@ class Request
     protected $cache;
     // 缓存是否检查
     protected $isCheckCache;
+    /**
+     * 是否合并Param
+     * @var bool
+     */
+    protected $mergeParam = false;
 
     /**
      * 构造函数
@@ -182,6 +187,18 @@ class Request
         return self::$instance;
     }
 
+    /**
+     * 销毁当前请求对象
+     * @access public
+     * @return void
+     */
+    public static function destroy()
+    {
+        if (!is_null(self::$instance)) {
+            self::$instance = null;
+        }
+    }
+
     /**
      * 创建一个URL请求
      * @access public
@@ -502,7 +519,7 @@ class Request
     {
         if (true === $method) {
             // 获取原始请求类型
-            return IS_CLI ? 'GET' : (isset($this->server['REQUEST_METHOD']) ? $this->server['REQUEST_METHOD'] : $_SERVER['REQUEST_METHOD']);
+            return $this->server('REQUEST_METHOD') ?: 'GET';
         } elseif (!$this->method) {
             if (isset($_POST[Config::get('var_method')])) {
                 $this->method = strtoupper($_POST[Config::get('var_method')]);
@@ -510,7 +527,7 @@ class Request
             } elseif (isset($_SERVER['HTTP_X_HTTP_METHOD_OVERRIDE'])) {
                 $this->method = strtoupper($_SERVER['HTTP_X_HTTP_METHOD_OVERRIDE']);
             } else {
-                $this->method = IS_CLI ? 'GET' : (isset($this->server['REQUEST_METHOD']) ? $this->server['REQUEST_METHOD'] : $_SERVER['REQUEST_METHOD']);
+                $this->method = $this->server('REQUEST_METHOD') ?: 'GET';
             }
         }
         return $this->method;
@@ -616,7 +633,7 @@ class Request
      */
     public function param($name = '', $default = null, $filter = '')
     {
-        if (empty($this->param)) {
+        if (empty($this->mergeParam)) {
             $method = $this->method(true);
             // 自动获取请求变量
             switch ($method) {
@@ -632,7 +649,8 @@ class Request
                     $vars = [];
             }
             // 当前请求参数和URL地址中的参数合并
-            $this->param = array_merge($this->get(false), $vars, $this->route(false));
+            $this->param      = array_merge($this->param, $this->get(false), $vars, $this->route(false));
+            $this->mergeParam = true;
         }
         if (true === $name) {
             // 获取包含文件上传信息的数组