diff --git a/weixin-java-pay/src/main/java/com/github/binarywang/wxpay/bean/request/WxPayDownloadBillRequest.java b/weixin-java-pay/src/main/java/com/github/binarywang/wxpay/bean/request/WxPayDownloadBillRequest.java
index 2838284c8..33e410cdd 100644
--- a/weixin-java-pay/src/main/java/com/github/binarywang/wxpay/bean/request/WxPayDownloadBillRequest.java
+++ b/weixin-java-pay/src/main/java/com/github/binarywang/wxpay/bean/request/WxPayDownloadBillRequest.java
@@ -1,5 +1,6 @@
 package com.github.binarywang.wxpay.bean.request;
 
+import com.github.binarywang.wxpay.constant.WxPayConstants.BillType;
 import com.github.binarywang.wxpay.exception.WxPayException;
 import com.thoughtworks.xstream.annotations.XStreamAlias;
 import me.chanjar.weixin.common.annotation.Required;
@@ -17,7 +18,8 @@ import java.util.Arrays;
  */
 @XStreamAlias("xml")
 public class WxPayDownloadBillRequest extends WxPayBaseRequest {
-  private static final String[] BILL_TYPE = new String[]{"ALL", "REFUND", "SUCCESS"};
+  private static final String[] BILL_TYPES = new String[]{BillType.ALL, BillType.SUCCESS, BillType.REFUND, BillType.RECHARGE_REFUND};
+  private static final String TAR_TYPE_GZIP = "GZIP";
 
   /**
    * <pre>
@@ -130,13 +132,13 @@ public class WxPayDownloadBillRequest extends WxPayBaseRequest {
 
   @Override
   protected void checkConstraints() throws WxPayException {
-    if (StringUtils.isNotBlank(this.getTarType()) && !"GZIP".equals(this.getTarType())) {
+    if (StringUtils.isNotBlank(this.getTarType()) && !TAR_TYPE_GZIP.equals(this.getTarType())) {
       throw new WxPayException("tar_type值如果存在，只能为GZIP");
     }
 
-    if (!ArrayUtils.contains(BILL_TYPE, this.getBillType())) {
-      throw new WxPayException(String.format("bill_tpye目前必须为%s其中之一,实际值：%s",
-        Arrays.toString(BILL_TYPE), this.getBillType()));
+    if (!ArrayUtils.contains(BILL_TYPES, this.getBillType())) {
+      throw new WxPayException(String.format("bill_type目前必须为%s其中之一,实际值：%s",
+        Arrays.toString(BILL_TYPES), this.getBillType()));
     }
   }
 }
diff --git a/weixin-java-pay/src/main/java/com/github/binarywang/wxpay/constant/WxPayConstants.java b/weixin-java-pay/src/main/java/com/github/binarywang/wxpay/constant/WxPayConstants.java
new file mode 100644
index 000000000..dc8ce23b8
--- /dev/null
+++ b/weixin-java-pay/src/main/java/com/github/binarywang/wxpay/constant/WxPayConstants.java
@@ -0,0 +1,87 @@
+package com.github.binarywang.wxpay.constant;
+
+/**
+ * <pre>
+ * 微信支付常量类
+ * Created by Binary Wang on 2017-8-24.
+ * </pre>
+ *
+ * @author <a href="https://github.com/binarywang">Binary Wang</a>
+ */
+public class WxPayConstants {
+  /**
+   * 校验用户姓名选项，企业付款时使用
+   */
+  public static class CheckNameOption {
+    /**
+     * 不校验真实姓名
+     */
+    public static final String NO_CHECK = "NO_CHECK";
+
+    /**
+     * 强校验真实姓名
+     */
+    public static final String FORCE_CHECK = "FORCE_CHECK";
+  }
+
+  /**
+   * 订单类型
+   */
+  public static class BillType {
+    /**
+     * 查询红包时使用：通过商户订单号获取红包信息
+     */
+    public static final String MCHT = "MCHT";
+
+    //以下为下载对账单时的账单类型
+    /**
+     * 返回当日所有订单信息，默认值
+     */
+    public static final String ALL = "ALL";
+    /**
+     * 返回当日成功支付的订单
+     */
+    public static final String SUCCESS = "SUCCESS";
+    /**
+     * 返回当日退款订单
+     */
+    public static final String REFUND = "REFUND";
+    /**
+     * 返回当日充值退款订单（相比其他对账单多一栏“返还手续费”）
+     */
+    public static final String RECHARGE_REFUND = "RECHARGE_REFUND";
+  }
+
+  /**
+   * 交易类型
+   */
+  public static class TradeType {
+    /**
+     * 原生扫码支付
+     */
+    public static final String NATIVE = "NATIVE";
+
+    /**
+     * App支付
+     */
+    public static final String APP = "APP";
+
+    /**
+     * 公众号支付
+     */
+    public static final String JSAPI = "JSAPI";
+
+    /**
+     * 刷卡支付，刷卡支付有单独的支付接口，不调用统一下单接口
+     */
+    public static final String MICROPAY = "MICROPAY";
+  }
+
+  /**
+   * 签名类型
+   */
+  public static class SignType {
+    public static final String HMAC_SHA256 = "HMAC-SHA256";
+    public static final String MD5 = "MD5";
+  }
+}
diff --git a/weixin-java-pay/src/main/java/com/github/binarywang/wxpay/service/impl/WxPayServiceAbstractImpl.java b/weixin-java-pay/src/main/java/com/github/binarywang/wxpay/service/impl/WxPayServiceAbstractImpl.java
index 616f86098..357cad09f 100644
--- a/weixin-java-pay/src/main/java/com/github/binarywang/wxpay/service/impl/WxPayServiceAbstractImpl.java
+++ b/weixin-java-pay/src/main/java/com/github/binarywang/wxpay/service/impl/WxPayServiceAbstractImpl.java
@@ -5,6 +5,9 @@ import com.github.binarywang.wxpay.bean.coupon.*;
 import com.github.binarywang.wxpay.bean.request.*;
 import com.github.binarywang.wxpay.bean.result.*;
 import com.github.binarywang.wxpay.config.WxPayConfig;
+import com.github.binarywang.wxpay.constant.WxPayConstants.BillType;
+import com.github.binarywang.wxpay.constant.WxPayConstants.SignType;
+import com.github.binarywang.wxpay.constant.WxPayConstants.TradeType;
 import com.github.binarywang.wxpay.exception.WxPayException;
 import com.github.binarywang.wxpay.service.WxPayService;
 import com.github.binarywang.wxpay.util.SignUtils;
@@ -129,7 +132,7 @@ public abstract class WxPayServiceAbstractImpl implements WxPayService {
   public WxPayRedpackQueryResult queryRedpack(String mchBillNo) throws WxPayException {
     WxPayRedpackQueryRequest request = new WxPayRedpackQueryRequest();
     request.setMchBillNo(mchBillNo);
-    request.setBillType("MCHT");
+    request.setBillType(BillType.MCHT);
     request.checkAndSign(this.getConfig());
 
     String url = this.getPayBaseUrl() + "/mmpaymkttransfers/gethbinfo";
@@ -199,35 +202,36 @@ public abstract class WxPayServiceAbstractImpl implements WxPayService {
     Map<String, String> payInfo = new HashMap<>();
     String timestamp = String.valueOf(System.currentTimeMillis() / 1000);
     String nonceStr = String.valueOf(System.currentTimeMillis());
-    if ("NATIVE".equals(request.getTradeType())) {
+    if (TradeType.NATIVE.equals(request.getTradeType())) {
       payInfo.put("codeUrl", unifiedOrderResult.getCodeURL());
-    } else if ("APP".equals(request.getTradeType())) {
+    } else if (TradeType.APP.equals(request.getTradeType())) {
       // APP支付绑定的是微信开放平台上的账号，APPID为开放平台上绑定APP后发放的参数
       String appId = getConfig().getAppId();
       Map<String, String> configMap = new HashMap<>();
       // 此map用于参与调起sdk支付的二次签名,格式全小写，timestamp只能是10位,格式固定，切勿修改
-      String partnerid = getConfig().getMchId();
+      String partnerId = getConfig().getMchId();
       configMap.put("prepayid", prepayId);
-      configMap.put("partnerid", partnerid);
-      configMap.put("package", "Sign=WXPay");
+      configMap.put("partnerid", partnerId);
+      String packageValue = "Sign=WXPay";
+      configMap.put("package", packageValue);
       configMap.put("timestamp", timestamp);
       configMap.put("noncestr", nonceStr);
       configMap.put("appid", appId);
       // 此map用于客户端与微信服务器交互
       payInfo.put("sign", SignUtils.createSign(configMap, this.getConfig().getMchKey()));
       payInfo.put("prepayId", prepayId);
-      payInfo.put("partnerId", partnerid);
+      payInfo.put("partnerId", partnerId);
       payInfo.put("appId", appId);
-      payInfo.put("packageValue", "Sign=WXPay");
+      payInfo.put("packageValue", packageValue);
       payInfo.put("timeStamp", timestamp);
       payInfo.put("nonceStr", nonceStr);
-    } else if ("JSAPI".equals(request.getTradeType())) {
+    } else if (TradeType.JSAPI.equals(request.getTradeType())) {
       payInfo.put("appId", unifiedOrderResult.getAppid());
       // 支付签名时间戳，注意微信jssdk中的所有使用timestamp字段均为小写。但最新版的支付后台生成签名使用的timeStamp字段名需大写其中的S字符
       payInfo.put("timeStamp", timestamp);
       payInfo.put("nonceStr", nonceStr);
       payInfo.put("package", "prepay_id=" + prepayId);
-      payInfo.put("signType", "MD5");
+      payInfo.put("signType", SignType.MD5);
       payInfo.put("paySign", SignUtils.createSign(payInfo, this.getConfig().getMchKey()));
     }
 
@@ -278,7 +282,6 @@ public abstract class WxPayServiceAbstractImpl implements WxPayService {
     String sign = SignUtils.createSign(params, this.getConfig().getMchKey());
     params.put("sign", sign);
 
-
     for (String key : params.keySet()) {
       codeUrl.append(key + "=" + params.get(key) + "&");
     }
@@ -327,8 +330,7 @@ public abstract class WxPayServiceAbstractImpl implements WxPayService {
       result.checkResult(this);
       return null;
     } else {
-      WxPayBillResult wxPayBillResult = billInformationDeal(responseContent);
-      return wxPayBillResult;
+      return billInformationDeal(responseContent);
     }
   }
 
@@ -346,10 +348,8 @@ public abstract class WxPayServiceAbstractImpl implements WxPayService {
      * 交易时间:2017-04-06 01:00:02 公众账号ID: 商户号: 子商户号:0 设备号:WEB 微信订单号: 商户订单号:2017040519091071873216 用户标识: 交易类型:NATIVE
      * 交易状态:REFUND 付款银行:CFT 货币种类:CNY 总金额:0.00 企业红包金额:0.00 微信退款单号: 商户退款单号:20170406010000933 退款金额:0.01 企业红包退款金额:0.00
      * 退款类型:ORIGINAL 退款状态:SUCCESS 商品名称: 商户数据包: 手续费:0.00000 费率 :0.60%
+     * 参考以上格式进行取值
      */
-
-    // 参考以上格式进行取值
-
     List<WxPayBillBaseResult> wxPayBillBaseResultLst = new LinkedList<>();
     String newStr = listStr.replaceAll(",", " "); // 去空格
     String[] tempStr = newStr.split("`"); // 数据分组
@@ -387,12 +387,11 @@ public abstract class WxPayServiceAbstractImpl implements WxPayService {
       k += t.length;
     }
     wxPayBillResult.setWxPayBillBaseResultLst(wxPayBillBaseResultLst);
+
     /*
      * 总交易单数,总交易额,总退款金额,总代金券或立减优惠退款金额,手续费总金额 `2,`0.02,`0.0,`0.0,`0
+     * 参考以上格式进行取值
      */
-
-    // 参考以上格式进行取值
-
     String totalStr = objStr.replaceAll(",", " ");
     String[] totalTempStr = totalStr.split("`");
     wxPayBillResult.setTotalRecord(totalTempStr[1]);
diff --git a/weixin-java-pay/src/test/java/com/github/binarywang/wxpay/service/impl/WxPayServiceAbstractImplTest.java b/weixin-java-pay/src/test/java/com/github/binarywang/wxpay/service/impl/WxPayServiceAbstractImplTest.java
index 7ac35a606..6d110a0ec 100644
--- a/weixin-java-pay/src/test/java/com/github/binarywang/wxpay/service/impl/WxPayServiceAbstractImplTest.java
+++ b/weixin-java-pay/src/test/java/com/github/binarywang/wxpay/service/impl/WxPayServiceAbstractImplTest.java
@@ -4,6 +4,10 @@ import com.github.binarywang.utils.qrcode.QrcodeUtils;
 import com.github.binarywang.wxpay.bean.coupon.*;
 import com.github.binarywang.wxpay.bean.request.*;
 import com.github.binarywang.wxpay.bean.result.*;
+import com.github.binarywang.wxpay.constant.WxPayConstants;
+import com.github.binarywang.wxpay.constant.WxPayConstants.BillType;
+import com.github.binarywang.wxpay.constant.WxPayConstants.SignType;
+import com.github.binarywang.wxpay.constant.WxPayConstants.TradeType;
 import com.github.binarywang.wxpay.exception.WxPayException;
 import com.github.binarywang.wxpay.service.WxPayService;
 import com.github.binarywang.wxpay.testbase.ApiTestModule;
@@ -33,23 +37,58 @@ public class WxPayServiceAbstractImplTest {
   @Inject
   private WxPayService payService;
 
+  /**
+   * Test method for {@link WxPayService#unifiedOrder(WxPayUnifiedOrderRequest)}.
+   */
+  @Test
+  public void testUnifiedOrder() throws WxPayException {
+    WxPayUnifiedOrderResult result = this.payService
+      .unifiedOrder(WxPayUnifiedOrderRequest.newBuilder()
+        .body("我去")
+        .totalFee(1)
+        .spbillCreateIp("11.1.11.1")
+        .notifyURL("111111")
+        .tradeType(TradeType.JSAPI)
+        .openid(((XmlWxPayConfig) this.payService.getConfig()).getOpenid())
+        .outTradeNo("1111112")
+        .build());
+    this.logger.info(result.toString());
+  }
+
   @Test
   public void testGetPayInfo() throws Exception {
     Map<String, String> payInfo = this.payService.getPayInfo(WxPayUnifiedOrderRequest.newBuilder()
       .body("我去")
       .totalFee(1)
-      .spbillCreateIp("111111")
+      .spbillCreateIp("1.11.1.11")
       .notifyURL("111111")
-      .tradeType("JSAPI")
-      .outTradeNo("111111")
+      .tradeType(TradeType.JSAPI)
+      .outTradeNo("1111113")
       .openid(((XmlWxPayConfig) this.payService.getConfig()).getOpenid())
       .build());
     this.logger.info(payInfo.toString());
   }
 
+  /**
+   * Test method for {@link WxPayService#queryOrder(String, String)} .
+   */
+  @Test
+  public void testQueryOrder() throws WxPayException {
+    this.logger.info(this.payService.queryOrder("11212121", null).toString());
+    this.logger.info(this.payService.queryOrder(null, "11111").toString());
+  }
+
+  /**
+   * Test method for {@link WxPayService#closeOrder(String)} .
+   */
+  @Test
+  public void testCloseOrder() throws WxPayException {
+    this.logger.info(this.payService.closeOrder("11212121").toString());
+  }
+
   @Test
   public void testDownloadBill() throws Exception {
-    WxPayBillResult wxPayBillResult = this.payService.downloadBill("20170101", "ALL", "GZIP", "1111111");
+    WxPayBillResult wxPayBillResult = this.payService.downloadBill("20170101", BillType.ALL, "GZIP", "1111111");
     //前一天没有账单记录返回null
     assertNotNull(wxPayBillResult);
     //必填字段为空时，抛出异常
@@ -60,7 +99,7 @@ public class WxPayServiceAbstractImplTest {
   public void testReport() throws Exception {
     WxPayReportRequest request = new WxPayReportRequest();
     request.setInterfaceUrl("hahahah");
-    request.setSignType("HMAC-SHA256");//貌似接口未校验此字段
+    request.setSignType(SignType.HMAC_SHA256);//貌似接口未校验此字段
     request.setExecuteTime(1000);
     request.setReturnCode("aaa");
     request.setResultCode("aaa");
@@ -130,41 +169,6 @@ public class WxPayServiceAbstractImplTest {
     this.logger.info(redpackResult.toString());
   }
 
-  /**
-   * Test method for {@link WxPayService#unifiedOrder(WxPayUnifiedOrderRequest)}.
-   */
-  @Test
-  public void testUnifiedOrder() throws WxPayException {
-    WxPayUnifiedOrderResult result = this.payService
-      .unifiedOrder(WxPayUnifiedOrderRequest.newBuilder()
-        .body("我去")
-        .totalFee(1)
-        .spbillCreateIp("11.1.11.1")
-        .notifyURL("111111")
-        .tradeType("JSAPI")
-        .openid(((XmlWxPayConfig) this.payService.getConfig()).getOpenid())
-        .outTradeNo("111111")
-        .build());
-    this.logger.info(result.toString());
-  }
-
-  /**
-   * Test method for {@link WxPayService#queryOrder(String, String)} .
-   */
-  @Test
-  public void testQueryOrder() throws WxPayException {
-    this.logger.info(this.payService.queryOrder("11212121", null).toString());
-    this.logger.info(this.payService.queryOrder(null, "11111").toString());
-  }
-
-  /**
-   * Test method for {@link WxPayService#closeOrder(String)} .
-   */
-  @Test
-  public void testCloseOrder() throws WxPayException {
-    this.logger.info(this.payService.closeOrder("11212121").toString());
-  }
-
   /**
    * Test method for {@link WxPayService#entPay(WxEntPayRequest)}.
    */
@@ -175,7 +179,7 @@ public class WxPayServiceAbstractImplTest {
       .openid("ojOQA0y9o-Eb6Aep7uVTdbkJqrP4")
       .amount(1)
       .spbillCreateIp("10.10.10.10")
-      .checkName("NO_CHECK")
+      .checkName(WxPayConstants.CheckNameOption.NO_CHECK)
       .description("描述信息")
       .build();