diff --git a/blade-service/blade-transport/src/main/java/org/springblade/transport/constant/HcsFieldConstant.java b/blade-service/blade-transport/src/main/java/org/springblade/transport/constant/HcsFieldConstant.java
new file mode 100644
index 00000000..bfe5b372
--- /dev/null
+++ b/blade-service/blade-transport/src/main/java/org/springblade/transport/constant/HcsFieldConstant.java
@@ -0,0 +1,201 @@
+/**
+ * BladeX Commercial License Agreement
+ * Copyright (c) 2018-2099, https://bladex.cn. All rights reserved.
+ * <p>
+ * Use of this software is governed by the Commercial License Agreement
+ * obtained after purchasing a license from BladeX.
+ * <p>
+ * 1. This software is for development use only under a valid license
+ * from BladeX.
+ * <p>
+ * 2. Redistribution of this software's source code to any third party
+ * without a commercial license is strictly prohibited.
+ * <p>
+ * 3. Licensees may copyright their own code but cannot use segments
+ * from this software for such purposes. Copyright of this software
+ * remains with BladeX.
+ * <p>
+ * Using this software signifies agreement to this License, and the software
+ * must not be used for illegal purposes.
+ * <p>
+ * THIS SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY. The author is
+ * not liable for any claims arising from secondary or illegal development.
+ * <p>
+ * Author: Chill Zhuang (bladejava@qq.com)
+ */
+package org.springblade.transport.constant;
+
+/**
+ * HCS（合同合规系统）列表查询 / 回调字段名常量（TMS 业务侧）
+ * <p>
+ * 与 {@link HcsContractFieldConstant}（C103-1/C103-11 表单字段）区分；
+ * 项目立项查询用下划线字段名，合同/开票查询与 B103 回调用驼峰字段名，以实际接口为准。
+ *
+ * @author Chill
+ */
+public final class HcsFieldConstant {
+
+	// ==================== C102-3 项目立项列表查询（下划线字段名） ====================
+
+	/**
+	 * 项目ID
+	 */
+	public static final String PROJ_FD_ID = "fd_id";
+
+	/**
+	 * 项目编号（判重条件键）
+	 */
+	public static final String PROJ_FD_NUM = "fd_num";
+
+	/**
+	 * 项目名称
+	 */
+	public static final String PROJ_FD_PRO_NAME = "fd_pro_name";
+
+	/**
+	 * 创建时间（排序字段）
+	 */
+	public static final String PROJ_FD_CREATE_TIME = "fd_create_time";
+
+	// ==================== C103-3 合同列表查询（驼峰字段名） ====================
+
+	/**
+	 * 合同ID
+	 */
+	public static final String CONTRACT_FD_ID = "fdId";
+
+	/**
+	 * 合同标题
+	 */
+	public static final String CONTRACT_FD_SUBJECT = "fdSubject";
+
+	/**
+	 * 合同编号（查询条件键）
+	 */
+	public static final String CONTRACT_FD_NUMBER = "fdNumber";
+
+	/**
+	 * 合同分类层级ID
+	 */
+	public static final String CONTRACT_FD_CATE_HIERARCHY_ID = "fdCateHierarchyId";
+
+	// ==================== C111-1 开票登记列表查询（驼峰字段名） ====================
+
+	/**
+	 * 单据ID
+	 */
+	public static final String INVOICE_FD_ID = "fdId";
+
+	/**
+	 * 单据编号（查询条件键）
+	 */
+	public static final String INVOICE_FD_NUMBER = "fdNumber";
+
+	/**
+	 * 开票日期
+	 */
+	public static final String INVOICE_FD_BILL_DATE = "fdBillDate";
+
+	/**
+	 * 合同编号
+	 */
+	public static final String INVOICE_FD_CONTRACT_NUMBER = "fdContractNumber";
+
+	/**
+	 * 开票金额
+	 */
+	public static final String INVOICE_FD_INVOICE_AMOUNT = "fdInvoiceAmount";
+
+	/**
+	 * 单据状态
+	 */
+	public static final String INVOICE_FD_STATUS = "fdStatus";
+
+	// ==================== B103 特批结果回调候选字段（报文未定稿，多候选解析，§6-U1） ====================
+
+	/**
+	 * 合同编号（驼峰）
+	 */
+	public static final String SPEC_CB_FD_CONTRACT_NO = "fdContractNo";
+
+	/**
+	 * 合同编号
+	 */
+	public static final String SPEC_CB_CONTRACT_NO = "contractNo";
+
+	/**
+	 * 合同编号（下划线）
+	 */
+	public static final String SPEC_CB_FD_CONTRACT_NO_SNAKE = "fd_contract_no";
+
+	/**
+	 * 合同编号（fd 模板字段，照 C103-3 查询惯例）
+	 */
+	public static final String SPEC_CB_FD_NUMBER = "fdNumber";
+
+	/**
+	 * 单据ID（驼峰）
+	 */
+	public static final String SPEC_CB_FD_ID = "fdId";
+
+	/**
+	 * 特批流程ID（驼峰）
+	 */
+	public static final String SPEC_CB_FD_SPEC_ID = "fdSpecId";
+
+	/**
+	 * 特批流程ID（下划线）
+	 */
+	public static final String SPEC_CB_FD_SPEC_ID_SNAKE = "fd_spec_id";
+
+	/**
+	 * 特批流程ID（specFdId）
+	 */
+	public static final String SPEC_CB_SPEC_FD_ID = "specFdId";
+
+	/**
+	 * 审批结果
+	 */
+	public static final String SPEC_CB_RESULT = "result";
+
+	/**
+	 * 审批结果（驼峰）
+	 */
+	public static final String SPEC_CB_FD_RESULT = "fdResult";
+
+	/**
+	 * 审批结果（下划线）
+	 */
+	public static final String SPEC_CB_FD_RESULT_SNAKE = "fd_result";
+
+	/**
+	 * 审批结果（approvalResult）
+	 */
+	public static final String SPEC_CB_APPROVAL_RESULT = "approvalResult";
+
+	/**
+	 * 状态（兜底候选）
+	 */
+	public static final String SPEC_CB_STATUS = "status";
+
+	/**
+	 * 合同编号候选键（依次取首个非空）
+	 */
+	public static final String[] SPEC_CB_CONTRACT_NO_KEYS = {SPEC_CB_FD_CONTRACT_NO, SPEC_CB_CONTRACT_NO,
+		SPEC_CB_FD_CONTRACT_NO_SNAKE, SPEC_CB_FD_NUMBER};
+
+	/**
+	 * 特批流程ID候选键（依次取首个非空）
+	 */
+	public static final String[] SPEC_CB_SPEC_FD_ID_KEYS = {SPEC_CB_FD_ID, SPEC_CB_FD_SPEC_ID,
+		SPEC_CB_FD_SPEC_ID_SNAKE, SPEC_CB_SPEC_FD_ID};
+
+	/**
+	 * 审批结果候选键（依次取首个非空）
+	 */
+	public static final String[] SPEC_CB_RESULT_KEYS = {SPEC_CB_RESULT, SPEC_CB_FD_RESULT,
+		SPEC_CB_FD_RESULT_SNAKE, SPEC_CB_APPROVAL_RESULT, SPEC_CB_STATUS};
+
+	private HcsFieldConstant() {
+	}
+}
diff --git a/blade-service/blade-transport/src/main/java/org/springblade/transport/support/hcs/HcsContractSpecSyncSupport.java b/blade-service/blade-transport/src/main/java/org/springblade/transport/support/hcs/HcsContractSpecSyncSupport.java
index f4773258..6a1423c7 100644
--- a/blade-service/blade-transport/src/main/java/org/springblade/transport/support/hcs/HcsContractSpecSyncSupport.java
+++ b/blade-service/blade-transport/src/main/java/org/springblade/transport/support/hcs/HcsContractSpecSyncSupport.java
@@ -38,6 +38,7 @@ import org.springblade.hcs.dto.HcsSpecContractSaveDTO;
 import org.springblade.hcs.dto.HcsFormSaveVO;
 import org.springblade.hcs.exception.HcsException;
 import org.springblade.hcs.feign.IHcsClient;
+import org.springblade.transport.constant.HcsFieldConstant;
 import org.springblade.transport.constant.HcsSyncConstant;
 import org.springblade.transport.mapper.ContractManageMapper;
 import org.springblade.transport.mapper.HcsContractCheckLogMapper;
@@ -162,9 +163,9 @@ public class HcsContractSpecSyncSupport {
 	 */
 	public String handleSpecCallback(Map<String, Object> body) {
 		String raw = body == null ? "" : JSONUtil.toJsonStr(body);
-		String contractNo = firstNonBlank(body, "fdContractNo", "contractNo", "fd_contract_no", "fdNumber");
-		String specFdId = firstNonBlank(body, "fdId", "fdSpecId", "fd_spec_id", "specFdId");
-		String resultText = firstNonBlank(body, "result", "fdResult", "fd_result", "approvalResult", "status");
+		String contractNo = firstNonBlank(body, HcsFieldConstant.SPEC_CB_CONTRACT_NO_KEYS);
+		String specFdId = firstNonBlank(body, HcsFieldConstant.SPEC_CB_SPEC_FD_ID_KEYS);
+		String resultText = firstNonBlank(body, HcsFieldConstant.SPEC_CB_RESULT_KEYS);
 		ContractManage contractManage = locateContract(contractNo, specFdId);
 		if (contractManage == null) {
 			log.warn("B103特批结果回传未定位到合同：contractNo={}，specFdId={}，报文已留痕", contractNo, specFdId);
diff --git a/blade-service/blade-transport/src/main/java/org/springblade/transport/support/hcs/HcsProjectSyncSupport.java b/blade-service/blade-transport/src/main/java/org/springblade/transport/support/hcs/HcsProjectSyncSupport.java
index 0154bff2..103d138b 100644
--- a/blade-service/blade-transport/src/main/java/org/springblade/transport/support/hcs/HcsProjectSyncSupport.java
+++ b/blade-service/blade-transport/src/main/java/org/springblade/transport/support/hcs/HcsProjectSyncSupport.java
@@ -45,6 +45,7 @@ import org.springblade.hcs.dto.HcsSaveOptionDTO;
 import org.springblade.hcs.dto.HcsUserRefVO;
 import org.springblade.hcs.exception.HcsException;
 import org.springblade.hcs.feign.IHcsClient;
+import org.springblade.transport.constant.HcsFieldConstant;
 import org.springblade.transport.constant.HcsSyncConstant;
 import org.springblade.transport.mapper.ProjectApplyMapper;
 import org.springblade.transport.pojo.entity.ProjectApply;
@@ -216,12 +217,12 @@ public class HcsProjectSyncSupport {
 	private String findExistFdId(ProjectApply projectApply) {
 		HcsPageQueryDTO query = new HcsPageQueryDTO();
 		// C102-3 入参 columns 用下划线字段名
-		query.setColumns(List.of("fd_id", "fd_num"));
+		query.setColumns(List.of(HcsFieldConstant.PROJ_FD_ID, HcsFieldConstant.PROJ_FD_NUM));
 		// 判重条件：项目编号精确匹配
-		query.setConditions(Map.of("fd_num", Objects.toString(projectApply.getProjectCode(), "")));
+		query.setConditions(Map.of(HcsFieldConstant.PROJ_FD_NUM, Objects.toString(projectApply.getProjectCode(), "")));
 		query.setOffset(0);
 		query.setPageSize(10);
-		query.setSorts(Map.of("fd_create_time", "desc"));
+		query.setSorts(Map.of(HcsFieldConstant.PROJ_FD_CREATE_TIME, "desc"));
 		// 查询需携带当前操作人（复用单据承办人登录名）
 		query.setCurUser(HcsUserRefVO.ofLoginName(requireLoginName(projectApply, "C102-3")));
 		HcsResult<HcsPageVO<HcsProjectVO>> result = hcsClient.projectList(query);
diff --git a/blade-service/blade-transport/src/main/java/org/springblade/transport/support/hcs/HcsReconSupport.java b/blade-service/blade-transport/src/main/java/org/springblade/transport/support/hcs/HcsReconSupport.java
index fdf1765b..b3c31662 100644
--- a/blade-service/blade-transport/src/main/java/org/springblade/transport/support/hcs/HcsReconSupport.java
+++ b/blade-service/blade-transport/src/main/java/org/springblade/transport/support/hcs/HcsReconSupport.java
@@ -33,6 +33,7 @@ import org.springblade.hcs.dto.HcsPageQueryDTO;
 import org.springblade.hcs.dto.HcsResult;
 import org.springblade.hcs.exception.HcsException;
 import org.springblade.hcs.feign.IHcsClient;
+import org.springblade.transport.constant.HcsFieldConstant;
 import org.springframework.stereotype.Component;
 
 import java.util.List;
@@ -63,9 +64,9 @@ public class HcsReconSupport {
 	public HcsResult<?> reconProject(String projectCode) {
 		HcsPageQueryDTO query = new HcsPageQueryDTO();
 		// C102-3 入参 columns 用下划线字段名
-		query.setColumns(List.of("fd_id", "fd_num", "fd_pro_name"));
+		query.setColumns(List.of(HcsFieldConstant.PROJ_FD_ID, HcsFieldConstant.PROJ_FD_NUM, HcsFieldConstant.PROJ_FD_PRO_NAME));
 		// 项目编号精确匹配
-		query.setConditions(Map.of("fd_num", Objects.toString(projectCode, "")));
+		query.setConditions(Map.of(HcsFieldConstant.PROJ_FD_NUM, Objects.toString(projectCode, "")));
 		query.setOffset(0);
 		query.setPageSize(50);
 		HcsResult<?> result = hcsClient.projectList(query);
@@ -80,9 +81,10 @@ public class HcsReconSupport {
 	 */
 	public HcsResult<?> reconContract(String contractNo) {
 		HcsPageQueryDTO query = new HcsPageQueryDTO();
-		query.setColumns(List.of("fdId", "fdSubject", "fdNumber", "fdCateHierarchyId"));
+		query.setColumns(List.of(HcsFieldConstant.CONTRACT_FD_ID, HcsFieldConstant.CONTRACT_FD_SUBJECT,
+			HcsFieldConstant.CONTRACT_FD_NUMBER, HcsFieldConstant.CONTRACT_FD_CATE_HIERARCHY_ID));
 		// 合同编号精确匹配（§9-U4 查询能力联调确认）
-		query.setConditions(Map.of("fdNumber", Objects.toString(contractNo, "")));
+		query.setConditions(Map.of(HcsFieldConstant.CONTRACT_FD_NUMBER, Objects.toString(contractNo, "")));
 		query.setOffset(0);
 		query.setPageSize(50);
 		HcsResult<?> result = hcsClient.contractList(query);
@@ -119,9 +121,11 @@ public class HcsReconSupport {
 	 */
 	public HcsResult<?> reconInvoiceRegistration(String applicationNo) {
 		HcsPageQueryDTO query = new HcsPageQueryDTO();
-		query.setColumns(List.of("fdId", "fdNumber", "fdBillDate", "fdContractNumber", "fdInvoiceAmount", "fdStatus"));
+		query.setColumns(List.of(HcsFieldConstant.INVOICE_FD_ID, HcsFieldConstant.INVOICE_FD_NUMBER,
+			HcsFieldConstant.INVOICE_FD_BILL_DATE, HcsFieldConstant.INVOICE_FD_CONTRACT_NUMBER,
+			HcsFieldConstant.INVOICE_FD_INVOICE_AMOUNT, HcsFieldConstant.INVOICE_FD_STATUS));
 		// 单据编号精确匹配（§9-U4 查询能力联调确认）
-		query.setConditions(Map.of("fdNumber", Objects.toString(applicationNo, "")));
+		query.setConditions(Map.of(HcsFieldConstant.INVOICE_FD_NUMBER, Objects.toString(applicationNo, "")));
 		query.setOffset(0);
 		query.setPageSize(50);
 		HcsResult<?> result = hcsClient.invoiceRegistrationList(query);