diff --git a/src/TTLock.php b/src/TTLock.php
index bff3475..2359930 100644
--- a/src/TTLock.php
+++ b/src/TTLock.php
@@ -37,12 +37,12 @@ class TTLock
 	private $client;
 
 
-	public function __construct( string $clientId, string $clientSecret )
+	public function __construct( string $clientId, string $clientSecret, string $base_uri = 'https://api.ttlock.com.cn' )
 	{
 		$this->clientId     = $clientId;
 		$this->clientSecret = $clientSecret;
 		$this->client       = new \GuzzleHttp\Client( [
-			'base_uri' => 'https://api.ttlock.com.cn',
+			'base_uri' => $base_uri,
 		] );
 	}
 
@@ -92,4 +92,4 @@ static function getDateTimeMillisecond( string $dateTime ) : int
 		$return_data = str_pad( $date.$sec, 13, "0", STR_PAD_RIGHT ); //不足13位。右边补0
 		return (int)$return_data;
 	}
-}
\ No newline at end of file
+}