diff --git a/library/think/cache/driver/Memcached.php b/library/think/cache/driver/Memcached.php
index 50082a1e..406f5855 100644
--- a/library/think/cache/driver/Memcached.php
+++ b/library/think/cache/driver/Memcached.php
@@ -17,13 +17,11 @@ class Memcached
 {
     protected $handler;
     protected $options = [
-        'host'     => '127.0.0.1',
-        'port'     => 11211,
-        'expire'   => 0,
-        'timeout'  => 0, // 超时时间（单位：毫秒）
-        'prefix'   => '',
-        'username' => '', //账号
-        'password' => '', //密码
+        'host'    => '127.0.0.1',
+        'port'    => 11211,
+        'expire'  => 0,
+        'timeout' => 0, // 超时时间（单位：毫秒）
+        'prefix'  => '',
     ];
 
     /**
@@ -56,10 +54,6 @@ class Memcached
             $servers[] = [$host, (isset($ports[$i]) ? $ports[$i] : $ports[0]), 1];
         }
         $this->handler->addServers($servers);
-        if ('' != $this->options['username']) {
-            $this->handler->setOption(\Memcached::OPT_BINARY_PROTOCOL, true);
-            $this->handler->setSaslAuthData($this->options['username'], $this->options['password']);
-        }
     }
 
     /**