diff --git a/library/think/File.php b/library/think/File.php
index 9dc81a2c..5457e26c 100644
--- a/library/think/File.php
+++ b/library/think/File.php
@@ -33,6 +33,8 @@ class File extends SplFileObject
     protected $isTest;
     // 上传文件信息
     protected $info;
+    // 文件hash信息
+    protected $hash = [];
 
     public function __construct($filename, $mode = 'r')
     {
@@ -92,6 +94,30 @@ class File extends SplFileObject
         return $this;
     }
 
+    /**
+     * 获取文件的md5散列值
+     * @return $this
+     */
+    public function md5()
+    {
+        if (!isset($this->hash['md5'])) {
+            $this->hash['md5'] = md5_file($this->filename);
+        }
+        return $this->hash['md5'];
+    }
+
+    /**
+     * 获取文件的sha1散列值
+     * @return $this
+     */
+    public function sha1()
+    {
+        if (!isset($this->hash['sha1'])) {
+            $this->hash['sha1'] = sha1_file($this->filename);
+        }
+        return $this->hash['sha1'];
+    }
+
     /**
      * 检查目录是否可写
      * @param  string   $path    目录
@@ -307,6 +333,7 @@ class File extends SplFileObject
         // 返回 File对象实例
         $file = new self($filename);
         $file->setSaveName($saveName);
+        $file->setUploadInfo($this->info);
         return $file;
     }