diff --git a/README.md b/README.md
index a55232c..8e779f8 100644
--- a/README.md
+++ b/README.md
@@ -19,7 +19,6 @@ func main() {
 	// 初始化配置
 	if err := pay.InitWxpay(pay.WxpayConfig{
 		MchID:                      "mchID",                      // 支付商户号
-		MchCertificateSerialNumber: "mchCertificateSerialNumber", // 证书序列号
 		MchAPIv3Key:                "mchAPIv3Key",                // apiV3密钥
 		PrivateKey:                 "privateKey",                 // 私钥证书密钥
 		PrivateCert:                "privateCert",                // 私钥证书