diff --git a/weixin-java-pay/src/main/java/com/github/binarywang/wxpay/bean/request/WxPayBaseRequest.java b/weixin-java-pay/src/main/java/com/github/binarywang/wxpay/bean/request/WxPayBaseRequest.java
index ad6f9d4c3..fad6d444f 100644
--- a/weixin-java-pay/src/main/java/com/github/binarywang/wxpay/bean/request/WxPayBaseRequest.java
+++ b/weixin-java-pay/src/main/java/com/github/binarywang/wxpay/bean/request/WxPayBaseRequest.java
@@ -173,6 +173,9 @@ public abstract class WxPayBaseRequest {
 
   public String toXML() {
     XStream xstream = XStreamInitializer.getInstance();
+    //涉及到服务商模式的两个参数，在为空值时置为null，以免在请求时将空值传给微信服务器
+    this.setSubAppId(StringUtils.trimToNull(this.getSubAppId()));
+    this.setSubMchId(StringUtils.trimToNull(this.getSubMchId()));
     xstream.processAnnotations(this.getClass());
     return xstream.toXML(this);
   }