diff --git a/src/main/java/com/xujie/sys/modules/sampletracking/service/impl/SampleTrackingServiceImpl.java b/src/main/java/com/xujie/sys/modules/sampletracking/service/impl/SampleTrackingServiceImpl.java
index 8c57e48c..70b9d192 100644
--- a/src/main/java/com/xujie/sys/modules/sampletracking/service/impl/SampleTrackingServiceImpl.java
+++ b/src/main/java/com/xujie/sys/modules/sampletracking/service/impl/SampleTrackingServiceImpl.java
@@ -31,6 +31,12 @@ import java.util.Objects;
 
 @Slf4j
 @Service
+/**
+ * 样品追踪模块核心实现：
+ * 1) 维护 tracking 表的增删改查；
+ * 2) 将 tracking 数据同步到 NPI 正式表（项目/物料/打样）；
+ * 3) 同步后执行 ID 对齐，保证 tracking 与 NPI 使用同一主键，便于后续跨表追溯。
+ */
 public class SampleTrackingServiceImpl implements SampleTrackingService {
 
     @Autowired
@@ -249,6 +255,8 @@ public class SampleTrackingServiceImpl implements SampleTrackingService {
             throw new RuntimeException("当前项目物料下无可同步打样单: " + oldProjectPartId);
         }
         List<Integer> syncedIds = new ArrayList<>();
+        // 批量同步时每轮都重新查一次列表：
+        // 因为单条同步会触发 trackingId 对齐（ID 可能变化），使用最新列表可避免漏同步/重复同步。
         while (true) {
             Integer pendingTrackingId = null;
             currentTrackingIds = sampleTrackingMapper.selectProofTrackingIdsByProjectPartId(syncedProjectPartId);
@@ -286,6 +294,8 @@ public class SampleTrackingServiceImpl implements SampleTrackingService {
         if (!missingFields.isEmpty()) {
             throw new RuntimeException("项目追踪记录缺少以下必填项，无法同步: " + String.join("、", missingFields));
         }
+        // 优先按“trackingId == npiId”的目标查 NPI：
+        // 若已存在则更新，不存在则插入，后续再统一做 tracking ID 对齐。
         Project existedNpiProject = projectMapper.selectById(trackingProjectId);
         Integer npiProjectId = existedNpiProject == null ? null : existedNpiProject.getProjectId();
         if (npiProjectId == null) {
@@ -303,6 +313,7 @@ public class SampleTrackingServiceImpl implements SampleTrackingService {
             trackingProject.setUpdateBy(operator);
             sampleTrackingMapper.updateNpiProjectFromTracking(trackingProject);
         }
+        // 对齐 tracking 主键到 NPI 主键，避免后续依赖方出现“同业务不同ID”的维护成本。
         alignTrackingProjectId(trackingProjectId, npiProjectId, operator);
         return npiProjectId;
     }
@@ -317,7 +328,9 @@ public class SampleTrackingServiceImpl implements SampleTrackingService {
         if (!missingPartFields.isEmpty()) {
             throw new RuntimeException("项目物料追踪记录缺少以下必填项，无法同步: " + String.join("、", missingPartFields));
         }
+        // 物料依赖项目主键，先确保项目已完成同步并拿到最终 NPI 项目ID。
         Integer npiProjectId = syncProjectInfoInternal(trackingPart.getProjectId(), operator);
+        // 重新读取一次 tracking 数据，避免并发修改导致使用旧快照覆盖新值。
         ProjectPartTrackingData latestPart = sampleTrackingMapper.selectProjectPartTrackingById(trackingProjectPartId);
         if (latestPart == null) {
             throw new RuntimeException("项目物料追踪记录不存在: " + trackingProjectPartId);
@@ -345,8 +358,10 @@ public class SampleTrackingServiceImpl implements SampleTrackingService {
             latestPart.setUpdateBy(operator);
             sampleTrackingMapper.updateNpiProjectPartFromTracking(latestPart);
         }
+        // 主键对齐放在最后执行，保证下游打样记录引用到最终 projectPartId。
         alignTrackingProjectPartId(trackingProjectPartId, npiProjectPartId, operator);
         latestPart.setProjectPartId(npiProjectPartId);
+        // 邮件放在事务提交后触发，避免邮件异常把本次同步回滚。
         registerProjectPartSyncMailAfterCommit(latestPart, operator);
         return npiProjectPartId;
     }
@@ -380,6 +395,8 @@ public class SampleTrackingServiceImpl implements SampleTrackingService {
         }
 
         Integer npiProofingId = null;
+        // 先按 trackingId 查，再按 proofingId 查：
+        // 用于兼容历史数据中“trackingId/proofingId已部分对齐”的场景，避免重复插入。
         ProofTrackingData existedByTrackingId = sampleTrackingMapper.selectNpiProofingById(trackingProofingId);
         if (existedByTrackingId != null) {
             npiProofingId = existedByTrackingId.getProofingId();
@@ -403,8 +420,10 @@ public class SampleTrackingServiceImpl implements SampleTrackingService {
             latestTrackingProof.setUpdateBy(operator);
             sampleTrackingMapper.updateNpiProofingFromTracking(latestTrackingProof);
         }
+        // 对齐打样 tracking 主键，同时维护日志/文档关联表，保证链路内所有 proofingId 一致。
         alignTrackingProofingId(trackingProofingId, npiProofingId, operator);
         sampleTrackingMapper.updateProofTrackingProofingIdByTrackingId(npiProofingId, npiProofingId, operator);
+        // 与 EAM“新增打样”保持一致：主记录落库后补齐打样文档清单初始化。
         ensureProofingDocumentAfterSync(npiProofingId, operator);
         return npiProofingId;
     }
@@ -413,6 +432,8 @@ public class SampleTrackingServiceImpl implements SampleTrackingService {
         if (Objects.equals(oldTrackingProjectId, newTrackingProjectId)) {
             return;
         }
+        // 若目标ID已被其他 tracking 记录占用，先把占位记录整体迁移到新ID，再回填当前记录。
+        // 这样可以避免直接覆盖造成数据丢失，并保证过程可追溯。
         Integer existedId = sampleTrackingMapper.existsProjectInfoTrackingId(newTrackingProjectId);
         if (existedId != null && !Objects.equals(existedId, oldTrackingProjectId)) {
             Integer replacementId = sampleTrackingMapper.selectNextProjectInfoTrackingId();
@@ -433,6 +454,7 @@ public class SampleTrackingServiceImpl implements SampleTrackingService {
         if (Objects.equals(oldTrackingProjectPartId, newTrackingProjectPartId)) {
             return;
         }
+        // 与项目ID对齐策略一致：先腾挪占位记录，再执行当前记录主键对齐。
         Integer existedId = sampleTrackingMapper.existsProjectPartTrackingId(newTrackingProjectPartId);
         if (existedId != null && !Objects.equals(existedId, oldTrackingProjectPartId)) {
             Integer replacementId = sampleTrackingMapper.selectNextProjectPartTrackingId();
@@ -451,6 +473,7 @@ public class SampleTrackingServiceImpl implements SampleTrackingService {
         if (Objects.equals(oldTrackingProofingId, newTrackingProofingId)) {
             return;
         }
+        // 打样ID冲突处理除主表外，还要同步维护日志与文档表引用，保证关联关系不断链。
         Integer existedId = sampleTrackingMapper.existsProofTrackingId(newTrackingProofingId);
         if (existedId != null && !Objects.equals(existedId, oldTrackingProofingId)) {
             Integer replacementId = sampleTrackingMapper.selectNextProofTrackingId();
@@ -474,6 +497,8 @@ public class SampleTrackingServiceImpl implements SampleTrackingService {
         if (trackingProjectId == null || trackingProjectPartId == null) {
             throw new RuntimeException("打样记录缺少项目或项目物料ID，请先同步项目和物料");
         }
+        // 这里不是仅校验“存在”，还要校验“关系一致”：
+        // 防止脏数据把打样同步到错误的项目/物料下。
         ProjectInfoTrackingData trackingProject = sampleTrackingMapper.selectProjectInfoTrackingById(trackingProjectId);
         if (trackingProject == null) {
             throw new RuntimeException("项目追踪记录不存在: " + trackingProjectId);
@@ -533,6 +558,7 @@ public class SampleTrackingServiceImpl implements SampleTrackingService {
         proofingDocumentData.setProjectPartId(syncedTracking.getProjectPartId());
         proofingDocumentData.setcProjectTypeDb(syncedTracking.getProjectCategory());
         proofingDocumentData.setCreateBy(resolveOperator(syncedTracking.getCreateBy(), operator));
+        // 复用现有文档初始化服务，避免在 sampleTracking 侧重复维护文档生成规则。
         proofingInformationService.proofingDocumentSave(proofingDocumentData);
     }
 
@@ -543,6 +569,7 @@ public class SampleTrackingServiceImpl implements SampleTrackingService {
         try {
             ProofingInformationData mailData = new ProofingInformationData();
             BeanUtils.copyProperties(syncedPart, mailData);
+            // 邮件模板字段分散在项目/物料两张 tracking 表，按“物料优先、项目兜底”组装。
             ProjectInfoTrackingData trackingProject = sampleTrackingMapper.selectProjectInfoTrackingById(syncedPart.getProjectId());
             if (trackingProject != null) {
                 if (isBlank(mailData.getProjectNo())) {
@@ -580,6 +607,7 @@ public class SampleTrackingServiceImpl implements SampleTrackingService {
         if (syncedPart == null) {
             return;
         }
+        // 使用快照而不是原对象，避免事务提交前后对象被其他逻辑修改。
         ProjectPartTrackingData mailSnapshot = new ProjectPartTrackingData();
         BeanUtils.copyProperties(syncedPart, mailSnapshot);
         if (TransactionSynchronizationManager.isSynchronizationActive()) {