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
index 59dd17ed6..60a56d100 100644
--- 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
@@ -175,17 +175,17 @@ public class WxPayConstants {
    */
   public static class AccountType {
     /**
-     * 基本账户
+     * BASIC：基本账户
      */
-    public static final String BASIC = "Basic";
+    public static final String BASIC = "BASIC";
     /**
-     * 运营账户
+     * OPERATION：运营账户
      */
-    public static final String OPERATION = "Operation";
+    public static final String OPERATION = "OPERATION";
     /**
-     * Fees
+     * FEES：手续费账户
      */
-    public static final String FEES = "Fees";
+    public static final String FEES = "FEES";
   }
 
   /**
diff --git a/weixin-java-pay/src/main/java/com/github/binarywang/wxpay/service/impl/BaseWxPayServiceImpl.java b/weixin-java-pay/src/main/java/com/github/binarywang/wxpay/service/impl/BaseWxPayServiceImpl.java
index 0e5579f1b..00046c871 100644
--- a/weixin-java-pay/src/main/java/com/github/binarywang/wxpay/service/impl/BaseWxPayServiceImpl.java
+++ b/weixin-java-pay/src/main/java/com/github/binarywang/wxpay/service/impl/BaseWxPayServiceImpl.java
@@ -1102,9 +1102,9 @@ public abstract class BaseWxPayServiceImpl implements WxPayService {
   public WxPayApplyBillV3Result applyFundFlowBill(WxPayApplyFundFlowBillV3Request request) throws WxPayException {
     String url;
     if (StringUtils.isBlank(request.getTarType())) {
-      url = String.format("%s/v3/bill/fundflowbill?bill_date=%s&bill_type=%s", this.getPayBaseUrl(), request.getBillDate(), request.getAccountType());
+      url = String.format("%s/v3/bill/fundflowbill?bill_date=%s&account_type=%s", this.getPayBaseUrl(), request.getBillDate(), request.getAccountType());
     } else {
-      url = String.format("%s/v3/bill/fundflowbill?bill_date=%s&bill_type=%s&tar_type=%s", this.getPayBaseUrl(), request.getBillDate(), request.getAccountType(), request.getTarType());
+      url = String.format("%s/v3/bill/fundflowbill?bill_date=%s&account_type=%s&tar_type=%s", this.getPayBaseUrl(), request.getBillDate(), request.getAccountType(), request.getTarType());
     }
     String response = this.getV3(url);
     return GSON.fromJson(response, WxPayApplyBillV3Result.class);