diff --git a/library/think/db/driver.php b/library/think/db/driver.php
index 0005674c..6abb9204 100644
--- a/library/think/db/driver.php
+++ b/library/think/db/driver.php
@@ -130,10 +130,11 @@ abstract class Driver {
      * @access public
      * @param string $str  sql指令
      * @param boolean $fetchSql  不执行只是获取SQL
+     * @param boolean $master  是否在主服务器读操作
      * @return mixed
      */
-    public function query($str,$fetchSql=false) {
-        $this->initConnect(false);
+    public function query($str,$fetchSql=false,$master=false) {
+        $this->initConnect($master);
         if ( !$this->_linkID ) return false;
         $this->queryStr     =   $str;
         if(!empty($this->bind)){
@@ -935,7 +936,7 @@ abstract class Driver {
         $this->model  =   $options['model'];
         $this->parseBind(!empty($options['bind'])?$options['bind']:array());
         $sql    = $this->buildSelectSql($options);
-        $result   = $this->query($sql,!empty($options['fetch_sql']) ? true : false);
+        $result   = $this->query($sql,!empty($options['fetch_sql']) ? true : false,!empty($options['read_master']) ? true : false);
         return $result;
     }
 
diff --git a/library/think/model.php b/library/think/model.php
index f1635a0b..70c5272a 100644
--- a/library/think/model.php
+++ b/library/think/model.php
@@ -1317,4 +1317,14 @@ class Model {
         }
         return $this;
     }
+
+    /**
+     * 设置从主服务器读取数据
+     * @access public
+     * @return Model
+     */
+    public function readMaster(){
+    	$this->options['read_master'] =	true;
+    	return $this;
+    }
 }
\ No newline at end of file