diff --git a/weixin-java-pay/src/main/java/com/github/binarywang/wxpay/bean/ecommerce/TransactionsResult.java b/weixin-java-pay/src/main/java/com/github/binarywang/wxpay/bean/ecommerce/TransactionsResult.java
index 6bb04f9a639379fd699df6b536c4e5fd333286e6..818bc5ec99a8f1724eb73f7c99151491825b98aa 100644
--- a/weixin-java-pay/src/main/java/com/github/binarywang/wxpay/bean/ecommerce/TransactionsResult.java
+++ b/weixin-java-pay/src/main/java/com/github/binarywang/wxpay/bean/ecommerce/TransactionsResult.java
@@ -83,7 +83,11 @@ public class TransactionsResult implements Serializable {
     private String packageValue;
     private String noncestr;
     private String timestamp;
+    private String sign;
 
+    private String getSignStr() {
+      return String.format("%s\n%s\n%s\n%s\n", appid, timestamp, noncestr, prepayid);
+    }
   }
 
   public <T> T getPayInfo(TradeTypeEnum tradeType, String appId, String mchId, PrivateKey privateKey) {
@@ -104,7 +108,7 @@ public class TransactionsResult implements Serializable {
         appResult.setAppid(appId).setPrepayid(this.prepayId).setPartnerid(mchId)
           .setNoncestr(nonceStr).setTimestamp(timestamp)
           //暂填写固定值Sign=WXPay
-          .setPackageValue("Sign=WXPay");
+          .setPackageValue("Sign=WXPay").setSign(SignUtils.sign(appResult.getSignStr(), privateKey));
         return (T) appResult;
       case NATIVE:
         return (T) this.codeUrl;