diff --git a/backend/services/data-management-service/src/main/java/com/datamate/datamanagement/application/DatasetApplicationService.java b/backend/services/data-management-service/src/main/java/com/datamate/datamanagement/application/DatasetApplicationService.java
index 7b7c0b4..cd33c11 100644
--- a/backend/services/data-management-service/src/main/java/com/datamate/datamanagement/application/DatasetApplicationService.java
+++ b/backend/services/data-management-service/src/main/java/com/datamate/datamanagement/application/DatasetApplicationService.java
@@ -1,5 +1,6 @@
 package com.datamate.datamanagement.application;
 
+import com.baomidou.mybatisplus.core.conditions.update.LambdaUpdateWrapper;
 import com.baomidou.mybatisplus.core.metadata.IPage;
 import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
 import com.datamate.common.domain.utils.ChunksSaver;
@@ -101,6 +102,10 @@ public class DatasetApplicationService {
     public Dataset updateDataset(String datasetId, UpdateDatasetRequest updateDatasetRequest) {
         Dataset dataset = datasetRepository.getById(datasetId);
         BusinessAssert.notNull(dataset, DataManagementErrorCode.DATASET_NOT_FOUND);
+        
+        // 保存原始的 parentDatasetId 值，用于比较是否发生了变化
+        String originalParentDatasetId = dataset.getParentDatasetId();
+        
         if (StringUtils.hasText(updateDatasetRequest.getName())) {
             dataset.setName(updateDatasetRequest.getName());
         }
@@ -117,10 +122,22 @@ public class DatasetApplicationService {
         // handleParentChange 内部通过 normalizeParentId 方法将空字符串和 null 都转换为 null
         // 这样既支持设置新的父数据集，也支持清除关联
         handleParentChange(dataset, updateDatasetRequest.getParentDatasetId());
+        
+        // 检查 parentDatasetId 是否发生了变化
+        if (!Objects.equals(originalParentDatasetId, dataset.getParentDatasetId())) {
+            // 使用 LambdaUpdateWrapper 显式地更新 parentDatasetId 字段
+            // 这样即使值为 null 也能被正确更新到数据库
+            datasetRepository.update(null, new LambdaUpdateWrapper<Dataset>()
+                .eq(Dataset::getId, datasetId)
+                .set(Dataset::getParentDatasetId, dataset.getParentDatasetId()));
+        }
+        
         if (StringUtils.hasText(updateDatasetRequest.getDataSource())) {
             // 数据源id不为空，使用异步线程进行文件扫盘落库
             processDataSourceAsync(dataset.getId(), updateDatasetRequest.getDataSource());
         }
+        
+        // 更新其他字段（不包括 parentDatasetId，因为它已经在上面的代码中更新了）
         datasetRepository.updateById(dataset);
         return dataset;
     }
diff --git a/backend/services/data-management-service/src/main/java/com/datamate/datamanagement/domain/model/dataset/Dataset.java b/backend/services/data-management-service/src/main/java/com/datamate/datamanagement/domain/model/dataset/Dataset.java
index 603fa5b..cf5375f 100644
--- a/backend/services/data-management-service/src/main/java/com/datamate/datamanagement/domain/model/dataset/Dataset.java
+++ b/backend/services/data-management-service/src/main/java/com/datamate/datamanagement/domain/model/dataset/Dataset.java
@@ -1,6 +1,5 @@
 package com.datamate.datamanagement.domain.model.dataset;
 
-import com.baomidou.mybatisplus.annotation.FieldStrategy;
 import com.baomidou.mybatisplus.annotation.TableField;
 import com.baomidou.mybatisplus.annotation.TableName;
 import com.baomidou.mybatisplus.extension.handlers.JacksonTypeHandler;
@@ -32,7 +31,6 @@ public class Dataset extends BaseEntity<String> {
     /**
      * 父数据集ID
      */
-    @TableField(updateStrategy = FieldStrategy.IGNORED)
     private String parentDatasetId;
     /**
      * 数据集类型