diff --git a/Library/Think/Model.php b/Library/Think/Model.php
index 2b4756b1..a491d6ca 100644
--- a/Library/Think/Model.php
+++ b/Library/Think/Model.php
@@ -102,7 +102,7 @@ class Model {
         // 数据库初始化操作
         // 获取数据库操作对象
         // 当前模型有独立的数据库连接信息
-        $this->db(0,empty($this->connection)?$connection:$this->connection);
+        $this->db(0,$this->connection);
     }
 
     /**