diff --git a/blade-service-api/blade-transport-api/src/main/java/org/springblade/transport/pojo/vo/WaybillImportDuplicateVO.java b/blade-service-api/blade-transport-api/src/main/java/org/springblade/transport/pojo/vo/WaybillImportDuplicateVO.java
new file mode 100644
index 00000000..66dc148a
--- /dev/null
+++ b/blade-service-api/blade-transport-api/src/main/java/org/springblade/transport/pojo/vo/WaybillImportDuplicateVO.java
@@ -0,0 +1,28 @@
+/**
+ * BladeX Commercial License Agreement
+ * Copyright (c) 2018-2099, https://bladex.cn. All rights reserved.
+ */
+package org.springblade.transport.pojo.vo;
+
+import io.swagger.v3.oas.annotations.media.Schema;
+import lombok.Data;
+
+import java.io.Serial;
+import java.io.Serializable;
+import java.util.ArrayList;
+import java.util.List;
+
+/** 运单批量导入行与已有运单的重复情况。 */
+@Data
+@Schema(description = "运单批量导入行与已有运单的重复情况")
+public class WaybillImportDuplicateVO implements Serializable {
+
+	@Serial
+	private static final long serialVersionUID = 1L;
+
+	@Schema(description = "行号（从0开始，相对当前批次）")
+	private Integer rowIndex;
+
+	@Schema(description = "命中的已有运单号")
+	private List<String> waybillNos = new ArrayList<>();
+}
diff --git a/blade-service/blade-transport/src/main/java/org/springblade/transport/controller/VoucherManageController.java b/blade-service/blade-transport/src/main/java/org/springblade/transport/controller/VoucherManageController.java
index 69f53eb0..abcee864 100644
--- a/blade-service/blade-transport/src/main/java/org/springblade/transport/controller/VoucherManageController.java
+++ b/blade-service/blade-transport/src/main/java/org/springblade/transport/controller/VoucherManageController.java
@@ -135,9 +135,10 @@ public class VoucherManageController extends BladeController {
 	@ApiOperationSupport(order = 7)
 	@Operation(summary = "可关联运输批次")
 	public R<IPage<Map<String, Object>>> waybillBatches(Query query, @RequestParam(required = false) String batchNo,
-		@RequestParam(required = false) String createUser, @RequestParam(required = false) Integer waybillCount,
-		@RequestParam(required = false) String createTimeStart, @RequestParam(required = false) String createTimeEnd) {
-		return R.data(voucherManageService.selectableWaybillBatches(Condition.getPage(query), batchNo, createUser, waybillCount, createTimeStart, createTimeEnd));
+		@RequestParam(required = false) Long projectId, @RequestParam(required = false) String createUser,
+		@RequestParam(required = false) Integer waybillCount, @RequestParam(required = false) String createTimeStart,
+		@RequestParam(required = false) String createTimeEnd) {
+		return R.data(voucherManageService.selectableWaybillBatches(Condition.getPage(query), batchNo, projectId, createUser, waybillCount, createTimeStart, createTimeEnd));
 	}
 
 	@PostMapping("/audit-pass")
diff --git a/blade-service/blade-transport/src/main/java/org/springblade/transport/controller/WaybillController.java b/blade-service/blade-transport/src/main/java/org/springblade/transport/controller/WaybillController.java
index 30af8573..c2c66d05 100644
--- a/blade-service/blade-transport/src/main/java/org/springblade/transport/controller/WaybillController.java
+++ b/blade-service/blade-transport/src/main/java/org/springblade/transport/controller/WaybillController.java
@@ -57,6 +57,7 @@ import org.springblade.transport.pojo.dto.WaybillImportBatchRequest;
 import org.springblade.transport.pojo.vo.BusinessRemoveResultVO;
 import org.springblade.transport.pojo.vo.LoadingManageVO;
 import org.springblade.transport.pojo.vo.WaybillImportBatchVO;
+import org.springblade.transport.pojo.vo.WaybillImportDuplicateVO;
 import org.springblade.transport.pojo.vo.WaybillImportValidateResultVO;
 import org.springblade.transport.pojo.vo.WaybillLocateVO;
 import org.springblade.transport.pojo.vo.WaybillTrackVO;
@@ -230,6 +231,13 @@ public class WaybillController extends BladeController {
 		waybillImportBatchService.exportFailures(request, response);
 	}
 
+	@PostMapping("/import-batch/duplicates")
+	@ApiOperationSupport(order = 6)
+	@Operation(summary = "查询与已有运单重复的导入行")
+	public R<List<WaybillImportDuplicateVO>> checkImportDuplicates(@RequestBody WaybillImportBatchRequest request) {
+		return R.data(waybillImportBatchService.checkDuplicates(request));
+	}
+
 	@PostMapping("/import-batch/confirm")
 	@ApiOperationSupport(order = 7)
 	@Operation(summary = "确认运单批量导入")
diff --git a/blade-service/blade-transport/src/main/java/org/springblade/transport/mapper/VoucherWaybillBatchMapper.java b/blade-service/blade-transport/src/main/java/org/springblade/transport/mapper/VoucherWaybillBatchMapper.java
index 86e7a57e..7c30968e 100644
--- a/blade-service/blade-transport/src/main/java/org/springblade/transport/mapper/VoucherWaybillBatchMapper.java
+++ b/blade-service/blade-transport/src/main/java/org/springblade/transport/mapper/VoucherWaybillBatchMapper.java
@@ -13,8 +13,9 @@ import org.apache.ibatis.annotations.Delete;
 public interface VoucherWaybillBatchMapper extends BaseMapper<VoucherWaybillBatch> {
 	@Delete("DELETE FROM blade_voucher_waybill_batch WHERE voucher_id = #{voucherId}")
 	int deletePhysicalByVoucherId(@Param("voucherId") Long voucherId);
-	IPage<Map<String, Object>> selectVoucherWaybillBatchPage(IPage<?> page, @Param("tenantId") String tenantId, @Param("batchNo") String batchNo, @Param("createUser") String createUser,
-		@Param("waybillCount") Integer waybillCount, @Param("createTimeStart") String createTimeStart, @Param("createTimeEnd") String createTimeEnd,
+	IPage<Map<String, Object>> selectVoucherWaybillBatchPage(IPage<?> page, @Param("tenantId") String tenantId, @Param("batchNo") String batchNo,
+		@Param("projectId") Long projectId, @Param("createUser") String createUser, @Param("waybillCount") Integer waybillCount,
+		@Param("createTimeStart") String createTimeStart, @Param("createTimeEnd") String createTimeEnd,
 		@Param("restrictCarrier") boolean restrictCarrier, @Param("carrierName") String carrierName);
 	List<Map<String, Object>> selectWaybillBatchesByIds(@Param("tenantId") String tenantId, @Param("ids") List<Long> ids,
 		@Param("restrictCarrier") boolean restrictCarrier, @Param("carrierName") String carrierName);
diff --git a/blade-service/blade-transport/src/main/java/org/springblade/transport/mapper/VoucherWaybillBatchMapper.xml b/blade-service/blade-transport/src/main/java/org/springblade/transport/mapper/VoucherWaybillBatchMapper.xml
index 2eadd452..4b599bb5 100644
--- a/blade-service/blade-transport/src/main/java/org/springblade/transport/mapper/VoucherWaybillBatchMapper.xml
+++ b/blade-service/blade-transport/src/main/java/org/springblade/transport/mapper/VoucherWaybillBatchMapper.xml
@@ -4,12 +4,14 @@
   <select id="selectVoucherWaybillBatchPage" resultType="java.util.LinkedHashMap">
     SELECT MIN(w.id) AS id, MAX(w.create_time) AS createTime, MAX(w.create_user) AS createUser,
       MAX(u.real_name) AS createUserName, COUNT(*) AS waybillCount,
+      CASE WHEN COUNT(DISTINCT COALESCE(w.project_id, -1)) > 1 THEN '多个项目' ELSE MAX(w.project_name) END AS projectName,
       COALESCE(NULLIF(w.batch_no, ''), '未分批运单') AS batchNo
     FROM blade_waybill w
     LEFT JOIN blade_user u ON u.id = w.create_user
     WHERE w.is_deleted = 0 AND w.tenant_id = #{tenantId}
     <if test="restrictCarrier">AND w.carrier_name = #{carrierName}</if>
     <if test="batchNo != null and batchNo != ''">AND w.batch_no LIKE CONCAT('%', #{batchNo}, '%')</if>
+    <if test="projectId != null">AND w.project_id = #{projectId}</if>
     <if test="createUser != null and createUser != ''">AND w.create_user = #{createUser}</if>
     <if test="createTimeStart != null and createTimeStart != ''">AND w.create_time <![CDATA[>=]]> #{createTimeStart}</if>
     <if test="createTimeEnd != null and createTimeEnd != ''">AND w.create_time <![CDATA[<=]]> #{createTimeEnd}</if>
diff --git a/blade-service/blade-transport/src/main/java/org/springblade/transport/service/IVoucherManageService.java b/blade-service/blade-transport/src/main/java/org/springblade/transport/service/IVoucherManageService.java
index b8a16346..e3a44df4 100644
--- a/blade-service/blade-transport/src/main/java/org/springblade/transport/service/IVoucherManageService.java
+++ b/blade-service/blade-transport/src/main/java/org/springblade/transport/service/IVoucherManageService.java
@@ -30,7 +30,7 @@ public interface IVoucherManageService extends BaseService<VoucherManage> {
 	void processUploadedVoucher(Long voucherId);
 	void reprocessUploadedVoucher(Long voucherId);
 	void removeVoucher(Long id);
-	IPage<Map<String, Object>> selectableWaybillBatches(IPage<?> page, String batchNo, String createUser, Integer waybillCount, String createTimeStart, String createTimeEnd);
+	IPage<Map<String, Object>> selectableWaybillBatches(IPage<?> page, String batchNo, Long projectId, String createUser, Integer waybillCount, String createTimeStart, String createTimeEnd);
 	void auditPass(Long id);
 	void auditReject(Long id, String rejectReason);
 }
diff --git a/blade-service/blade-transport/src/main/java/org/springblade/transport/service/IWaybillImportBatchService.java b/blade-service/blade-transport/src/main/java/org/springblade/transport/service/IWaybillImportBatchService.java
index 58c60733..0d3e7536 100644
--- a/blade-service/blade-transport/src/main/java/org/springblade/transport/service/IWaybillImportBatchService.java
+++ b/blade-service/blade-transport/src/main/java/org/springblade/transport/service/IWaybillImportBatchService.java
@@ -7,8 +7,11 @@ import org.springblade.transport.pojo.dto.WaybillImportBatchRequest;
 import org.springblade.transport.pojo.entity.WaybillImportBatch;
 import org.springblade.transport.pojo.vo.BusinessRemoveResultVO;
 import org.springblade.transport.pojo.vo.WaybillImportBatchVO;
+import org.springblade.transport.pojo.vo.WaybillImportDuplicateVO;
 import org.springblade.transport.pojo.vo.WaybillImportValidateResultVO;
 
+import java.util.List;
+
 /** 运单批次服务。 */
 public interface IWaybillImportBatchService extends BaseService<WaybillImportBatch> {
 	WaybillImportBatch saveDraft(WaybillImportBatchRequest request);
@@ -18,4 +21,7 @@ public interface IWaybillImportBatchService extends BaseService<WaybillImportBat
 	IPage<WaybillImportBatchVO> page(IPage<WaybillImportBatch> page, WaybillImportBatchRequest request);
 	BusinessRemoveResultVO removeBatches(String ids);
 	String nextBatchNo();
+
+	/** 逐行比对导入行与项目下已有运单，返回命中的运单号。 */
+	List<WaybillImportDuplicateVO> checkDuplicates(WaybillImportBatchRequest request);
 }
diff --git a/blade-service/blade-transport/src/main/java/org/springblade/transport/service/impl/VoucherManageServiceImpl.java b/blade-service/blade-transport/src/main/java/org/springblade/transport/service/impl/VoucherManageServiceImpl.java
index 3553602e..c3baf36c 100644
--- a/blade-service/blade-transport/src/main/java/org/springblade/transport/service/impl/VoucherManageServiceImpl.java
+++ b/blade-service/blade-transport/src/main/java/org/springblade/transport/service/impl/VoucherManageServiceImpl.java
@@ -1331,8 +1331,8 @@ public class VoucherManageServiceImpl extends BaseServiceImpl<VoucherManageMappe
 	}
 
 	@Override
-	public IPage<Map<String, Object>> selectableWaybillBatches(IPage<?> page, String batchNo, String createUser, Integer waybillCount, String createTimeStart, String createTimeEnd) {
-		return voucherWaybillBatchMapper.selectVoucherWaybillBatchPage(page, AuthUtil.getTenantId(), batchNo, createUser, waybillCount, createTimeStart, createTimeEnd,
+	public IPage<Map<String, Object>> selectableWaybillBatches(IPage<?> page, String batchNo, Long projectId, String createUser, Integer waybillCount, String createTimeStart, String createTimeEnd) {
+		return voucherWaybillBatchMapper.selectVoucherWaybillBatchPage(page, AuthUtil.getTenantId(), batchNo, projectId, createUser, waybillCount, createTimeStart, createTimeEnd,
 			!TransportBusinessSupport.isAdministrator(), currentCarrierName());
 	}
 
diff --git a/blade-service/blade-transport/src/main/java/org/springblade/transport/service/impl/WaybillImportBatchServiceImpl.java b/blade-service/blade-transport/src/main/java/org/springblade/transport/service/impl/WaybillImportBatchServiceImpl.java
index 5eabbc36..9e4c9e1b 100644
--- a/blade-service/blade-transport/src/main/java/org/springblade/transport/service/impl/WaybillImportBatchServiceImpl.java
+++ b/blade-service/blade-transport/src/main/java/org/springblade/transport/service/impl/WaybillImportBatchServiceImpl.java
@@ -12,6 +12,7 @@ import jakarta.servlet.http.HttpServletResponse;
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
 import org.springblade.common.excel.ImportFailureExcelUtil;
+import org.springblade.common.excel.LenientDateParser;
 import org.springblade.core.log.exception.ServiceException;
 import org.springblade.core.mp.base.BaseServiceImpl;
 import org.springblade.core.secure.utils.AuthUtil;
@@ -39,6 +40,7 @@ import org.springblade.transport.pojo.entity.Waybill;
 import org.springblade.transport.pojo.entity.WaybillImportBatch;
 import org.springblade.transport.pojo.vo.BusinessRemoveResultVO;
 import org.springblade.transport.pojo.vo.WaybillImportBatchVO;
+import org.springblade.transport.pojo.vo.WaybillImportDuplicateVO;
 import org.springblade.transport.pojo.vo.WaybillImportRowErrorVO;
 import org.springblade.transport.pojo.vo.WaybillImportValidateResultVO;
 import org.springblade.transport.service.ICustomerArchiveService;
@@ -50,6 +52,7 @@ import org.springblade.transport.service.ITransportPlanService;
 import org.springblade.transport.service.IWaybillImportBatchService;
 import org.springblade.transport.service.IWaybillService;
 import org.springblade.transport.support.TransportBusinessSupport;
+import org.springblade.transport.support.VehiclePlateSupport;
 import org.springblade.transport.support.WaybillProcessSupport;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
@@ -173,6 +176,94 @@ public class WaybillImportBatchServiceImpl extends BaseServiceImpl<WaybillImport
 		return toVO(batch);
 	}
 
+	@Override
+	public List<WaybillImportDuplicateVO> checkDuplicates(WaybillImportBatchRequest request) {
+		List<WaybillImportDuplicateVO> duplicates = new ArrayList<>();
+		if (request == null || Func.isEmpty(request.getRows()) || Func.isEmpty(request.getProjectId())) {
+			return duplicates;
+		}
+		List<Long> carrierIds = resolveCarrierIds(request);
+		String carrierName = resolveCarrierNames(carrierIds, request.getCarrierName());
+		LambdaQueryWrapper<Waybill> wrapper = Wrappers.<Waybill>lambdaQuery()
+			.eq(Waybill::getIsDeleted, 0)
+			.eq(Waybill::getProjectId, request.getProjectId());
+		if (Func.isNotEmpty(request.getId())) {
+			// 追加导入时，本批次已落库的运单不算历史运单。
+			wrapper.ne(Waybill::getImportBatchId, request.getId());
+		}
+		List<Waybill> candidates = waybillService.list(wrapper);
+		if (Func.isEmpty(candidates)) {
+			return duplicates;
+		}
+		List<Map<String, Object>> rows = request.getRows();
+		for (int index = 0; index < rows.size(); index++) {
+			List<String> waybillNos = new ArrayList<>();
+			for (Waybill waybill : candidates) {
+				if (!isDuplicateRow(rows.get(index), waybill, carrierIds, carrierName)) continue;
+				String waybillNo = waybill.getWaybillNo();
+				if (Func.isNotEmpty(waybillNo) && !waybillNos.contains(waybillNo)) {
+					waybillNos.add(waybillNo);
+				}
+			}
+			if (waybillNos.isEmpty()) continue;
+			WaybillImportDuplicateVO duplicate = new WaybillImportDuplicateVO();
+			duplicate.setRowIndex(index);
+			duplicate.setWaybillNos(waybillNos);
+			duplicates.add(duplicate);
+		}
+		return duplicates;
+	}
+
+	/**
+	 * 判重口径为导入必填项逐一相同：承运商、车牌、运输方式、起止地址、货物名称与类型、
+	 * 数量及单位、实际发货与实际完成时间。历史运单这些字段常为空，双方都空按相同处理。
+	 */
+	private boolean isDuplicateRow(Map<String, Object> row, Waybill waybill, List<Long> carrierIds, String carrierName) {
+		if (row == null || waybill == null) return false;
+		if (!carrierMatches(waybill, carrierIds, carrierName)) return false;
+		if (!samePlate(vehicleNoFromRow(row), waybill.getVehicleNo())) return false;
+		String transportType = resolveTransportTypeKey(
+			stringValue(row, "transportType", "运输类型", "*运输类型", "运输方式", "*运输方式"));
+		if (!sameText(transportType, waybill.getTransportType())) return false;
+		if (!sameText(stringValue(row, "departureAddress"), waybill.getDepartureAddress())) return false;
+		if (!sameText(stringValue(row, "arrivalAddress"), waybill.getArrivalAddress())) return false;
+		if (!sameText(stringValue(row, "cargoName"), waybill.getCargoName())) return false;
+		if (!sameText(stringValue(row, "cargoType"), waybill.getCargoType())) return false;
+		BigDecimal quantity = defaultQuantity(decimalValue(row, "quantity", "数量", "重量"));
+		if (quantity.compareTo(defaultQuantity(waybill.getQuantity())) != 0) return false;
+		String quantityUnit = stringValue(row, "quantityUnit", "数量单位");
+		if (!sameText(Func.isEmpty(quantityUnit) ? "吨" : quantityUnit, waybill.getQuantityUnit())) return false;
+		if (!Objects.equals(duplicateDate(row.get("actualStartDate")), waybill.getStartDate())) {
+			return false;
+		}
+		return Objects.equals(duplicateDate(row.get("actualEndDate")), waybill.getEndDate());
+	}
+
+	/** 承运商优先按档案 ID 比对；历史手工运单只有名称，退化为名称比对。 */
+	private boolean carrierMatches(Waybill waybill, List<Long> carrierIds, String carrierName) {
+		if (Func.isNotEmpty(carrierIds) && waybill.getCarrierId() != null) {
+			return carrierIds.contains(waybill.getCarrierId());
+		}
+		return sameText(waybill.getCarrierName(), carrierName);
+	}
+
+	private boolean sameText(String left, String right) {
+		String a = left == null ? "" : left.trim();
+		String b = right == null ? "" : right.trim();
+		return a.equalsIgnoreCase(b);
+	}
+
+	private boolean samePlate(String left, String right) {
+		return VehiclePlateSupport.normalize(left).equals(VehiclePlateSupport.normalize(right));
+	}
+
+	/** 判重时的日期解析不阻断查询：无法识别的日期返回 null，按「与空值相同」处理。 */
+	private LocalDate duplicateDate(Object value) {
+		if (value == null) return null;
+		String text = String.valueOf(value).trim();
+		return text.isEmpty() ? null : LenientDateParser.parseDateLenientlyOrNull(text);
+	}
+
 	/** 草稿与确认导入共用落库流程，差异仅在于运单是否走校验以及是否生成应收应付明细。 */
 	private WaybillImportBatch persist(WaybillImportBatchRequest request, String importStatus) {
 		boolean draft = STATUS_DRAFT.equals(importStatus);
diff --git a/blade-service/blade-transport/src/test/java/org/springblade/transport/service/impl/WaybillImportDuplicateTest.java b/blade-service/blade-transport/src/test/java/org/springblade/transport/service/impl/WaybillImportDuplicateTest.java
new file mode 100644
index 00000000..3a05e92e
--- /dev/null
+++ b/blade-service/blade-transport/src/test/java/org/springblade/transport/service/impl/WaybillImportDuplicateTest.java
@@ -0,0 +1,163 @@
+package org.springblade.transport.service.impl;
+
+import com.baomidou.mybatisplus.core.conditions.Wrapper;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+import org.springblade.system.feign.ISysClient;
+import org.springblade.transport.pojo.dto.WaybillImportBatchRequest;
+import org.springblade.transport.pojo.entity.Waybill;
+import org.springblade.transport.pojo.vo.WaybillImportDuplicateVO;
+import org.springblade.transport.service.ICustomerArchiveService;
+import org.springblade.transport.service.IDriverService;
+import org.springblade.transport.service.ILoadingManageService;
+import org.springblade.transport.service.IProjectApplyService;
+import org.springblade.transport.service.IReceivablePayableDetailService;
+import org.springblade.transport.service.ITransportPlanService;
+import org.springblade.transport.service.IWaybillService;
+
+import java.math.BigDecimal;
+import java.time.LocalDate;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.when;
+
+/**
+ * 批量导入行与历史运单的判重测试。
+ * <p>
+ * 口径为导入必填项逐一相同；历史手工运单的承运商档案 ID 与时间列常为空，
+ * 这类字段双方都空时按相同处理，否则手工运单永远判不出重复。
+ */
+class WaybillImportDuplicateTest {
+
+	private static final Long PROJECT_ID = 1001L;
+	private static final Long CARRIER_ID = 2002L;
+	private static final String CARRIER_NAME = "广西驰远干线运输有限公司";
+	private static final String VEHICLE_NO = "桂A5D61N";
+	private static final String CARGO_NAME = "混煤";
+	private static final String DEPARTURE = "鄂尔多斯市达拉特旗树林召镇";
+	private static final String ARRIVAL = "南宁市江南区沙井大道";
+
+	private IWaybillService waybillService;
+	private WaybillImportBatchServiceImpl service;
+
+	@BeforeEach
+	void setUp() {
+		waybillService = mock(IWaybillService.class);
+		service = new WaybillImportBatchServiceImpl(
+			waybillService,
+			mock(ICustomerArchiveService.class),
+			mock(IProjectApplyService.class),
+			mock(ITransportPlanService.class),
+			mock(IReceivablePayableDetailService.class),
+			mock(ILoadingManageService.class),
+			mock(ISysClient.class),
+			mock(IDriverService.class));
+	}
+
+	@Test
+	@DisplayName("必填项全一致：返回命中的已有运单号")
+	void reportsDuplicateWaybillNo() {
+		stubCandidates(waybill("YD-20261023-0012"));
+
+		WaybillImportBatchRequest req = request(importRow());
+		List<WaybillImportDuplicateVO> duplicates = service.checkDuplicates(req);
+
+		assertEquals(1, duplicates.size(), "rows=" + req.getRows() + " projectId=" + req.getProjectId());
+		assertEquals(0, duplicates.get(0).getRowIndex());
+		assertEquals(List.of("YD-20261023-0012"), duplicates.get(0).getWaybillNos());
+	}
+
+	@Test
+	@DisplayName("数量不同：不判为重复")
+	void ignoresDifferentQuantity() {
+		stubCandidates(waybill("YD-20261023-0012"));
+		Map<String, Object> row = importRow();
+		row.put("quantity", "21");
+
+		assertTrue(service.checkDuplicates(request(row)).isEmpty());
+	}
+
+	@Test
+	@DisplayName("车牌大小写与空格不同：仍判为重复")
+	void ignoresPlateFormatting() {
+		stubCandidates(waybill("YD-20261023-0012"));
+		Map<String, Object> row = importRow();
+		row.put("vehicleNo", " 桂a5d61n ");
+
+		assertEquals(1, service.checkDuplicates(request(row)).size());
+	}
+
+	@Test
+	@DisplayName("历史运单没有承运商档案 ID：退化为承运商名称比对")
+	void matchesByCarrierNameWhenHistoryHasNoId() {
+		Waybill waybill = waybill("YD-20261023-0012");
+		waybill.setCarrierId(null);
+		stubCandidates(waybill);
+
+		assertEquals(1, service.checkDuplicates(request(importRow())).size());
+	}
+
+	@Test
+	@DisplayName("项目为空：直接返回空，不查库")
+	void returnsEmptyWithoutProject() {
+		WaybillImportBatchRequest request = request(importRow());
+		request.setProjectId(null);
+
+		assertTrue(service.checkDuplicates(request).isEmpty());
+	}
+
+	private void stubCandidates(Waybill... waybills) {
+		when(waybillService.list(any(Wrapper.class))).thenReturn(List.of(waybills));
+	}
+
+	private WaybillImportBatchRequest request(Map<String, Object> row) {
+		WaybillImportBatchRequest request = new WaybillImportBatchRequest();
+		request.setProjectId(PROJECT_ID);
+		request.setCarrierId(CARRIER_ID);
+		request.setCarrierName(CARRIER_NAME);
+		request.setRows(List.of(row));
+		return request;
+	}
+
+	private Map<String, Object> importRow() {
+		Map<String, Object> row = new HashMap<>();
+		row.put("vehicleNo", VEHICLE_NO);
+		// 无 Spring 上下文时字典读不到，运输方式按“名称即键”兜底，故此处直接给内部键。
+		row.put("transportType", "road");
+		row.put("departureAddress", DEPARTURE);
+		row.put("arrivalAddress", ARRIVAL);
+		row.put("cargoName", CARGO_NAME);
+		row.put("cargoType", "煤制品");
+		row.put("quantity", "20");
+		row.put("quantityUnit", "吨");
+		row.put("actualStartDate", "2026-10-13");
+		row.put("actualEndDate", "2026-10-14");
+		return row;
+	}
+
+	private Waybill waybill(String waybillNo) {
+		Waybill waybill = new Waybill();
+		waybill.setWaybillNo(waybillNo);
+		waybill.setProjectId(PROJECT_ID);
+		waybill.setCarrierId(CARRIER_ID);
+		waybill.setCarrierName(CARRIER_NAME);
+		waybill.setVehicleNo(VEHICLE_NO);
+		waybill.setTransportType("road");
+		waybill.setDepartureAddress(DEPARTURE);
+		waybill.setArrivalAddress(ARRIVAL);
+		waybill.setCargoName(CARGO_NAME);
+		waybill.setCargoType("煤制品");
+		waybill.setQuantity(new BigDecimal("20.00"));
+		waybill.setQuantityUnit("吨");
+		waybill.setStartDate(LocalDate.of(2026, 10, 13));
+		waybill.setEndDate(LocalDate.of(2026, 10, 14));
+		return waybill;
+	}
+}