diff --git a/service/wechatpayopen/set.go b/service/wechatpayopen/set.go
index eec43d85..f80df112 100644
--- a/service/wechatpayopen/set.go
+++ b/service/wechatpayopen/set.go
@@ -2,7 +2,7 @@ package wechatpayopen
 
 // SubConfig 子商户配置
 func (c *Client) SubConfig(subAppid, subMchId string) *Client {
-	c.config.SpAppid = subAppid
+	c.config.SubAppid = subAppid
 	c.config.SubMchId = subMchId
 	return c
 }