diff --git a/library/think/Model.php b/library/think/Model.php
index f4f77c13..5962e636 100644
--- a/library/think/Model.php
+++ b/library/think/Model.php
@@ -169,6 +169,17 @@ abstract class Model implements \JsonSerializable, \ArrayAccess
         return !empty($item) ? $item : [];
     }
 
+    /**
+     * 转换当前模型对象为JSON字符串
+     * @access public
+     * @param integer $options json参数
+     * @return string
+     */
+    public function toJson($options = JSON_UNESCAPED_UNICODE)
+    {
+        return json_encode($this->toArray(), $options);
+    }
+
     /**
      * 获取当前模型对象的主键
      * @access public
@@ -980,7 +991,7 @@ abstract class Model implements \JsonSerializable, \ArrayAccess
 
     public function __toString()
     {
-        return json_encode($this->toArray());
+        return $this->toJson();
     }
 
     // JsonSerializable