diff --git a/library/think/db/connector/Mysql.php b/library/think/db/connector/Mysql.php
index 536125fd1a..9d146c7136 100644
--- a/library/think/db/connector/Mysql.php
+++ b/library/think/db/connector/Mysql.php
@@ -31,12 +31,15 @@ class Mysql extends Connection
      */
     protected function parseDsn($config)
     {
-        $dsn = 'mysql:dbname=' . $config['database'] . ';host=' . $config['hostname'];
-        if (!empty($config['hostport'])) {
-            $dsn .= ';port=' . $config['hostport'];
-        } elseif (!empty($config['socket'])) {
-            $dsn .= ';unix_socket=' . $config['socket'];
+        if (!empty($config['socket'])) {
+            $dsn = 'mysql:unix_socket=' . $config['socket'];
+        } elseif (!empty($config['hostport'])) {
+            $dsn = 'mysql:host=' . $config['hostname'] . ';port=' . $config['hostport'];
+        } else {
+            $dsn = 'mysql:host=' . $config['hostname'];
         }
+        $dsn .= ';dbname=' . $config['database'];
+
         if (!empty($config['charset'])) {
             $dsn .= ';charset=' . $config['charset'];
         }