diff --git a/library/think/db/connector/Sqlsrv.php b/library/think/db/connector/Sqlsrv.php
index cfc80991..31cf9045 100644
--- a/library/think/db/connector/Sqlsrv.php
+++ b/library/think/db/connector/Sqlsrv.php
@@ -24,7 +24,6 @@ class Sqlsrv extends Connection
         PDO::ATTR_CASE              => PDO::CASE_LOWER,
         PDO::ATTR_ERRMODE           => PDO::ERRMODE_EXCEPTION,
         PDO::ATTR_STRINGIFY_FETCHES => false,
-        PDO::SQLSRV_ATTR_ENCODING   => PDO::SQLSRV_ENCODING_UTF8,
     ];
 
     /**