diff --git a/weixin4j-base/src/main/java/com/foxinmy/weixin4j/http/HttpRequest.java b/weixin4j-base/src/main/java/com/foxinmy/weixin4j/http/HttpRequest.java
index 977351c8..43bf1316 100644
--- a/weixin4j-base/src/main/java/com/foxinmy/weixin4j/http/HttpRequest.java
+++ b/weixin4j-base/src/main/java/com/foxinmy/weixin4j/http/HttpRequest.java
@@ -130,7 +130,7 @@ public class HttpRequest {
 	public Response post(String url, String body) throws WeixinException {
 		HttpPost method = new HttpPost(url);
 		method.setEntity(new StringEntity(body, ContentType.create(
-				ContentType.APPLICATION_JSON.getMimeType(), Consts.UTF_8)));
+				ContentType.DEFAULT_TEXT.getMimeType(), Consts.UTF_8)));
 		return doRequest(method);
 	}
 
@@ -222,8 +222,8 @@ public class HttpRequest {
 	}
 
 	private void checkJson(Response response) throws WeixinException {
-		response.setJsonResult(true);
 		JsonResult jsonResult = response.getAsJsonResult();
+		response.setJsonResult(true);
 		if (jsonResult.getCode() != 0) {
 			if (StringUtils.isBlank(jsonResult.getDesc())) {
 				jsonResult = response.getTextError(jsonResult.getCode());
@@ -234,7 +234,6 @@ public class HttpRequest {
 	}
 
 	private void checkXml(Response response) throws WeixinException {
-		response.setXmlResult(true);
 		XmlResult xmlResult = null;
 		try {
 			xmlResult = response.getAsXmlResult();
@@ -250,6 +249,7 @@ public class HttpRequest {
 			response.setText(newXml);
 			xmlResult = response.getAsXmlResult();
 		}
+		response.setXmlResult(true);
 		if (xmlResult.getReturnCode().equals("0")) {
 			return;
 		}
diff --git a/weixin4j-mp/weixin4j-mp-api/src/main/java/com/foxinmy/weixin4j/mp/payment/PayUtil.java b/weixin4j-mp/weixin4j-mp-api/src/main/java/com/foxinmy/weixin4j/mp/payment/PayUtil.java
index 7a900a56..c008016f 100644
--- a/weixin4j-mp/weixin4j-mp-api/src/main/java/com/foxinmy/weixin4j/mp/payment/PayUtil.java
+++ b/weixin4j-mp/weixin4j-mp-api/src/main/java/com/foxinmy/weixin4j/mp/payment/PayUtil.java
@@ -125,7 +125,7 @@ public class PayUtil {
 	 * md5签名(一般用于V3.x支付接口)
 	 * 
 	 * @param obj
-	 *           签名对象
+	 *            签名对象
 	 * @param paySignKey
 	 *            支付API的密钥
 	 * @return
@@ -192,7 +192,7 @@ public class PayUtil {
 	}
 
 	/**
-	 * 创建预支付对象
+	 * 创建预支付对象</br> <font color="red">此方法并不包含签名,需要自己传入一个完整并且合法的PayPackage</font>
 	 * 
 	 * @param payPackage
 	 *            包含订单信息的对象
@@ -200,19 +200,22 @@ public class PayUtil {
 	 * @see com.foxinmy.weixin4j.mp.payment.v3.PrePay
 	 * @return 预支付对象
 	 */
-	public static PrePay createPrePay(PayPackageV3 payPackage) {
-		PrePay prePay = null;
+	public static PrePay createPrePay(PayPackageV3 payPackage)
+			throws PayException {
+		if (StringUtils.isBlank(payPackage.getSign())) {
+			// String paySignKey = weixinAccount.getPaySignKey();
+			// payPackage.setSign(paysignMd5(payPackage, paySignKey));
+		}
 		String payJsRequestXml = XStream.to(payPackage).replaceAll("__", "_");
 		HttpRequest request = new HttpRequest();
+		Response response = null;
 		try {
-			Response response = request.post(Consts.UNIFIEDORDER,
-					payJsRequestXml);
-			prePay = response.getAsObject(new TypeReference<PrePay>() {
+			response = request.post(Consts.UNIFIEDORDER, payJsRequestXml);
+			return response.getAsObject(new TypeReference<PrePay>() {
 			});
 		} catch (WeixinException e) {
-			prePay = new PrePay(e.getErrorCode(), e.getErrorMsg());
+			throw new PayException(e.getErrorCode(), e.getErrorMsg());
 		}
-		return prePay;
 	}
 
 	/**
diff --git a/weixin4j-mp/weixin4j-mp-server/src/main/java/com/foxinmy/weixin4j/mp/action/PayAction.java b/weixin4j-mp/weixin4j-mp-server/src/main/java/com/foxinmy/weixin4j/mp/action/PayAction.java
index 42769728..68616f34 100644
--- a/weixin4j-mp/weixin4j-mp-server/src/main/java/com/foxinmy/weixin4j/mp/action/PayAction.java
+++ b/weixin4j-mp/weixin4j-mp-server/src/main/java/com/foxinmy/weixin4j/mp/action/PayAction.java
@@ -106,10 +106,10 @@ public class PayAction {
 		 * bank_type=2032&discount=0&fee_type=1&input_charset=UTF-8&
 		 * notify_id=9fKbVf_qg6y-
 		 * wSjtSMV0PLXeEn2oGfTM1s9dWSvR2B9U6iFQRTzmjrMWKUxvh9mpBLvnh8aqFbC_OFk1pTvFnFUO00Lln4fh
-		 * & out_trade_no=D14102900031&partner=1221928801&product_fee=1&sign=
-		 * B9D6E772C271C9B86B8436FC9F5DFC1A&
-		 * sign_type=MD5&time_end=20141029183707
-		 * &total_fee=1&trade_mode=1&trade_state=0&
+		 * & out_trade_no=D14102900031&partner=1221928801&product_fee=1&
+		 * sign=B9D6E772C271C9B86B8436FC9F5DFC1A&
+		 * sign_type=MD5&time_end=20141029183707&
+		 * total_fee=1&trade_mode=1&trade_state=0&
 		 * transaction_id=1221928801201410296039230054&transport_fee=0
 		 */
 		log.info("jspay_notify_orderinfo,{}", objMap);
@@ -216,8 +216,8 @@ public class PayAction {
 	 * &ltis_subscribe&gt1&lt/is_subscribe&gt</br>
 	 * &ltproduct_id&gt[CDATA[000000]]&lt/product_id&gt</br>
 	 * &ltnonce_str&gt&lt![CDATA[jALldRTHAFd5Tgs5]]&gt&lt/nonce_str&gt</br>
-	 * &ltsign>&lt![CDATA[bafe07f060f22dcda0bfdb4b5ff756f973aecffa]]&gt&lt/sign&
-	 * gt</br> &lt/xml&gt</br>
+	 * &ltsign>&lt![CDATA[bafe07f060f22dcda0bfdb4b5ff756f973aecffa]]&gt
+	 * &lt/sign&gt</br> &lt/xml&gt</br>
 	 * 
 	 * @return
 	 * @throws PayException