diff --git a/src/main/java/com/xujie/modules/inspection/service/impl/InspectionRequestServiceImpl.java b/src/main/java/com/xujie/modules/inspection/service/impl/InspectionRequestServiceImpl.java
index c048bcc..0b24a0e 100644
--- a/src/main/java/com/xujie/modules/inspection/service/impl/InspectionRequestServiceImpl.java
+++ b/src/main/java/com/xujie/modules/inspection/service/impl/InspectionRequestServiceImpl.java
@@ -2066,6 +2066,61 @@ public class InspectionRequestServiceImpl extends ServiceImpl<InspectionRequestH
         }
     }
 
+    /**
+     * 打样单取消审核后，清空验货完成时回写的 c_china_office_inspection_date 与 c_inspection_result。
+     * 与 syncSamplePoOfficeInspectionOnCompleted 对称：同样仅处理 order_type='Sample' 的订单，
+     * 定位/去重/容错策略保持一致，保证审核-取消审核可反复往返不残留脏数据。
+     */
+    private void clearSamplePoOfficeInspectionOnRollback(String site,
+                                                         String requestNo,
+                                                         Integer itemNo,
+                                                         List<InspectionRequestDetailSub> subList) {
+        if (subList == null || subList.isEmpty()) {
+            return;
+        }
+
+        Set<String> updatedPoKeys = new HashSet<>();
+        Map<String, Boolean> samplePoCache = new HashMap<>();
+        for (InspectionRequestDetailSub sub : subList) {
+            if (sub == null || !StringUtils.hasText(sub.getPoNo()) || sub.getPoItemNo() == null) {
+                continue;
+            }
+            String poNo = sub.getPoNo().trim();
+            String poKey = poNo + "#" + sub.getPoItemNo();
+            if (!updatedPoKeys.add(poKey)) {
+                continue;
+            }
+            Boolean isSamplePo = samplePoCache.computeIfAbsent(poNo, key -> {
+                POHeader poHeader = poheaderMapper.selectOne(
+                        new LambdaQueryWrapper<POHeader>()
+                                .eq(POHeader::getSite, site)
+                                .eq(POHeader::getOrderNo, key)
+                );
+                return poHeader != null && "Sample".equals(poHeader.getOrderType());
+            });
+            if (!Boolean.TRUE.equals(isSamplePo)) {
+                continue;
+            }
+
+            int affectedRows = podetailMapper.update(null,
+                    new LambdaUpdateWrapper<PODetail>()
+                            .eq(PODetail::getSite, site)
+                            .eq(PODetail::getOrderNo, poNo)
+                            .eq(PODetail::getItemNo, sub.getPoItemNo())
+                            // SQL Server 驱动会把未声明 jdbcType 的 null 按 varbinary 绑定，DATE 列不接受隐式转换，必须显式指定
+                            .set(PODetail::getChinaOfficeInspectionDate, null, "jdbcType=DATE")
+                            .set(PODetail::getInspectionResult, null, "jdbcType=VARCHAR")
+            );
+            if (affectedRows == 0) {
+                log.warn("打样单取消审核清空PODetail回写未命中: site={}, requestNo={}, itemNo={}, poNo={}, poItemNo={}",
+                        site, requestNo, itemNo, poNo, sub.getPoItemNo());
+                continue;
+            }
+            log.info("打样单取消审核清空PODetail回写成功: site={}, requestNo={}, itemNo={}, poNo={}, poItemNo={}",
+                    site, requestNo, itemNo, poNo, sub.getPoItemNo());
+        }
+    }
+
     @Transactional(rollbackFor = Exception.class)
     @Override
     public void rollbackInspectionResult(String site, String requestNo, Integer itemNo) {
@@ -2097,6 +2152,9 @@ public class InspectionRequestServiceImpl extends ServiceImpl<InspectionRequestH
         );
         applyApproveQtyToPoDetails(site, detail, subList, false);
 
+        // 3.1 打样单取消审核时，清空验货完成时回写的 China office 验货日期与检验结论
+        clearSamplePoOfficeInspectionOnRollback(site, requestNo, itemNo, subList);
+
         // 4. 更新指定明细状态为验货中，并清空检验通过数量
         int updateCount = inspectionRequestDetailMapper.update(null,
                 new LambdaUpdateWrapper<InspectionRequestDetail>()