diff --git a/library/think/Model.php b/library/think/Model.php
index a5df413a..4aa4c4e5 100644
--- a/library/think/Model.php
+++ b/library/think/Model.php
@@ -853,10 +853,11 @@ abstract class Model implements \JsonSerializable, \ArrayAccess
 
         if (!isset(self::$links[$model])) {
             self::$links[$model] = Db::connect(static::$connection);
+            self::$links[$model]->setTable(static::$tableName);
+            $name = basename(str_replace('\\', '/', $model));
+            self::$links[$model]->name($name);
         }
-        self::$links[$model]->setTable(static::$tableName);
-        $name = basename(str_replace('\\', '/', $model));
-        self::$links[$model]->name($name);
+
         // 设置当前模型 确保查询返回模型对象
         self::$links[$model]->model($model);
         // 返回当前数据库对象
diff --git a/library/think/db/Builder.php b/library/think/db/Builder.php
index 08dbbb7e..9872c815 100644
--- a/library/think/db/Builder.php
+++ b/library/think/db/Builder.php
@@ -38,10 +38,20 @@ abstract class Builder
      * @access public
      * @param object $db 数据库对象实例
      */
-    public function __construct($connection, $query)
+    public function __construct($connection)
     {
         $this->connection = $connection;
-        $this->query      = $query;
+    }
+
+    /**
+     * 设置当前的Query对象实例
+     * @access protected
+     * @param \think\db\Query $query 当前查询对象实例
+     * @return void
+     */
+    public function setQuery($query)
+    {
+        $this->query = $query;
     }
 
     /**
@@ -299,13 +309,13 @@ abstract class Builder
             if ($value instanceof \Closure) {
                 $whereStr .= $key . ' ' . $exp . ' ' . $this->parseClosure($value);
             } else {
-                $value = is_array($value) ? $value : explode(',', $value) ;
+                $value = is_array($value) ? $value : explode(',', $value);
                 $zone  = implode(',', $this->parseValue($value));
                 $whereStr .= $key . ' ' . $exp . ' (' . $zone . ')';
             }
         } elseif (in_array($exp, ['NOT BETWEEN', 'BETWEEN'])) {
             // BETWEEN 查询
-            $data = is_array($value) ? $value  : explode(',', $value) ;
+            $data = is_array($value) ? $value : explode(',', $value);
             $whereStr .= $key . ' ' . $exp . ' ' . $this->parseValue($data[0]) . ' AND ' . $this->parseValue($data[1]);
         } elseif (in_array($exp, ['NOT EXISTS', 'EXISTS'])) {
             // EXISTS 查询
diff --git a/library/think/db/Query.php b/library/think/db/Query.php
index dd33037c..1c3e5fe4 100644
--- a/library/think/db/Query.php
+++ b/library/think/db/Query.php
@@ -77,8 +77,10 @@ class Query
         $driver         = $this->driver;
         if (!isset($builder[$driver])) {
             $class            = '\\think\\db\\builder\\' . ucfirst($driver);
-            $builder[$driver] = new $class($this->connection, $this);
+            $builder[$driver] = new $class($this->connection);
         }
+        // 设置当前查询对象
+        $builder[$driver]->setQuery($this);
         return $builder[$driver];
     }