diff --git a/weixin/base.go b/weixin/base.go
index de1cfb7..3a30e6c 100644
--- a/weixin/base.go
+++ b/weixin/base.go
@@ -49,7 +49,7 @@ type BaseSdk struct {
 }
 
 type OaMenuButton struct {
-	Type      string          `json:"type"`
+	Type      string          `json:"type,omitempty"`
 	Name      string          `json:"name"`
 	Key       string          `json:"key,omitempty"`
 	Url       string          `json:"url,omitempty"`