diff --git a/weixin4j-base/src/main/java/com/foxinmy/weixin4j/http/factory/HttpComponent3Factory.java b/weixin4j-base/src/main/java/com/foxinmy/weixin4j/http/factory/HttpComponent3Factory.java
index 3ed89b8c..18da82cd 100644
--- a/weixin4j-base/src/main/java/com/foxinmy/weixin4j/http/factory/HttpComponent3Factory.java
+++ b/weixin4j-base/src/main/java/com/foxinmy/weixin4j/http/factory/HttpComponent3Factory.java
@@ -14,7 +14,7 @@ import org.apache.commons.httpclient.HttpClient;
 public class HttpComponent3Factory extends HttpClientFactory {
 
 	public HttpComponent3Factory() {
-		// odd bug
+		// odd code
 		Class<HttpClient> _dead = HttpClient.class;
 	}
 
diff --git a/weixin4j-base/src/main/java/com/foxinmy/weixin4j/payment/mch/MchPayRequest.java b/weixin4j-base/src/main/java/com/foxinmy/weixin4j/payment/mch/MchPayRequest.java
index 49106ca9..bac2e279 100644
--- a/weixin4j-base/src/main/java/com/foxinmy/weixin4j/payment/mch/MchPayRequest.java
+++ b/weixin4j-base/src/main/java/com/foxinmy/weixin4j/payment/mch/MchPayRequest.java
@@ -8,6 +8,8 @@ import javax.xml.bind.annotation.XmlTransient;
 import com.alibaba.fastjson.JSON;
 import com.alibaba.fastjson.annotation.JSONField;
 import com.foxinmy.weixin4j.payment.PayRequest;
+import com.foxinmy.weixin4j.payment.PayUtil;
+import com.foxinmy.weixin4j.type.SignType;
 
 /**
  * JS支付:get_brand_wcpay_request</br>
@@ -58,6 +60,26 @@ public class MchPayRequest extends PayRequest {
 		return prePay;
 	}
 
+	/**
+	 * 针对未签名的 MchPayRequest
+	 * 
+	 * @param paySignKey
+	 *            支付签名密钥
+	 * @return
+	 */
+	@XmlTransient
+	@JSONField(serialize = false)
+	public String asPayJsRequestJson(String paySignKey) {
+		this.setSignType(SignType.MD5);
+		this.setPaySign(PayUtil.paysignMd5(this, paySignKey));
+		return asPayJsRequestJson();
+	}
+
+	/**
+	 * 针对已签名的 MchPayRequest
+	 * 
+	 * @return
+	 */
 	@XmlTransient
 	@JSONField(serialize = false)
 	public String asPayJsRequestJson() {