diff --git a/lib/payment.js b/lib/payment.js
index 332cc04..017895e 100644
--- a/lib/payment.js
+++ b/lib/payment.js
@@ -282,8 +282,12 @@ Payment.prototype.parseCsv = function(text){
 };
 
 Payment.prototype.buildXml = function (obj) {
-  var builder = new xml2js.Builder();
-  var xml = builder.buildObject({xml:obj});
+  var builder = new xml2js.Builder({
+    allowSurrogateChars: true
+  });
+  var xml = builder.buildObject({
+    xml:obj
+  });
   return xml;
 };
 
diff --git a/package.json b/package.json
index 9c49224..227fe53 100644
--- a/package.json
+++ b/package.json
@@ -1,12 +1,14 @@
 {
   "name": "wechat-pay",
-  "version": "0.2.2",
+  "version": "0.2.4",
   "description": "wechat payment api for document v3.3.5",
   "main": "index.js",
-  "scripts": {
+  "scripts":
+  {
     "test": "echo \"Error: no test specified\" && exit 1"
   },
-  "repository": {
+  "repository":
+  {
     "type": "git",
     "url": "git://github.com/supersheep/wechat-pay.git"
   },
@@ -16,15 +18,17 @@
   ],
   "author": "spud",
   "license": "ISC",
-  "bugs": {
+  "bugs":
+  {
     "url": "https://github.com/supersheep/wechat-pay/issues"
   },
   "homepage": "https://github.com/supersheep/wechat-pay",
-  "dependencies": {
+  "dependencies":
+  {
     "md5": "^2.0.0",
     "request": "^2.45.0",
     "sha1": "^1.1.0",
     "underscore": "^1.7.0",
     "xml2js": "^0.4.4"
   }
-}
+}
\ No newline at end of file