diff --git a/convention.php b/convention.php
index 2659285e..78bced55 100644
--- a/convention.php
+++ b/convention.php
@@ -136,12 +136,12 @@ return [
 
     // 是否使用session
     'use_session'           => true,
-    'var_session_id'        => '', // SESSION_ID的提交变量
     'session'               => [
-        'id'         => '',
-        'prefix'     => 'think',
-        'type'       => '',
-        'auto_start' => true,
+        'id'             => '',
+        'var_session_id' => '', // SESSION_ID的提交变量,解决flash上传跨域
+        'prefix'         => 'think',
+        'type'           => '',
+        'auto_start'     => true,
     ],
 
     // +----------------------------------------------------------------------
diff --git a/library/think/Session.php b/library/think/Session.php
index 02fc33c8..1e832779 100644
--- a/library/think/Session.php
+++ b/library/think/Session.php
@@ -39,8 +39,8 @@ class Session
         if (isset($config['prefix'])) {
             self::$prefix = $config['prefix'];
         }
-        if (Config::get('var_session_id') && isset($_REQUEST[Config::get('var_session_id')])) {
-            session_id($_REQUEST[Config::get('var_session_id')]);
+        if ($config['var_session_id'] && isset($_REQUEST[$config['var_session_id']])) {
+            session_id($_REQUEST[$config['var_session_id']]);
         } elseif (isset($config['id']) && !empty($config['id'])) {
             session_id($config['id']);
         }