diff --git a/src/main/java/com/filesystem/service/FileService.java b/src/main/java/com/filesystem/service/FileService.java
index ad08385..6aeff5e 100644
--- a/src/main/java/com/filesystem/service/FileService.java
+++ b/src/main/java/com/filesystem/service/FileService.java
@@ -50,19 +50,18 @@ public class FileService {
         
         boolean hasKeyword = keyword != null && !keyword.isEmpty();
         
+        // 根目录：folderId == null 或 0 都视为根目录，统一用 0 查询
+        Long actualFolderId = (folderId == null || folderId == 0L) ? 0L : folderId;
+        
         if (hasKeyword) {
             // 有搜索关键词：根目录搜索查所有，子目录搜索限当前目录
-            if (folderId != null) {
+            if (!actualFolderId.equals(0L)) {
                 wrapper.eq(FileEntity::getFolderId, folderId);
             }
             wrapper.like(FileEntity::getName, keyword);
         } else {
             // 无搜索关键词：正常浏览当前目录
-            if (folderId != null) {
-                wrapper.eq(FileEntity::getFolderId, folderId);
-            } else {
-                wrapper.isNull(FileEntity::getFolderId);
-            }
+            wrapper.eq(FileEntity::getFolderId, actualFolderId);
         }
         
         wrapper.orderByDesc(FileEntity::getIsFolder)
@@ -77,10 +76,13 @@ public class FileService {
                .eq(FileEntity::getIsDeleted, 1)
                .orderByDesc(FileEntity::getDeletedAt);
         
-        if (folderId != null) {
-            wrapper.eq(FileEntity::getFolderId, folderId);
+        // 根目录：folderId == null 或 0 都视为根目录
+        Long actualFolderId = (folderId == null || folderId == 0L) ? 0L : folderId;
+        // 根目录在数据库中兼容 null 和 0 两种值
+        if (actualFolderId.equals(0L)) {
+            wrapper.and(w -> w.eq(FileEntity::getFolderId, 0L).or().isNull(FileEntity::getFolderId));
         } else {
-            wrapper.isNull(FileEntity::getFolderId);
+            wrapper.eq(FileEntity::getFolderId, actualFolderId);
         }
         
         return fileMapper.selectList(wrapper);
@@ -93,26 +95,45 @@ public class FileService {
     @Transactional
     public void moveToTrash(Long id, Long userId) {
         FileEntity file = fileMapper.selectById(id);
-        if (file != null && file.getUserId().equals(userId)) {
-            // 如果是文件夹，检查是否有子文件
-            if (file.getIsFolder() != null && file.getIsFolder() == 1) {
-                Long childCount = fileMapper.selectCount(
-                    new LambdaQueryWrapper<FileEntity>()
-                        .eq(FileEntity::getFolderId, id)
-                        .eq(FileEntity::getIsDeleted, 0)
-                        .eq(FileEntity::getUserId, userId)
-                );
-                if (childCount != null && childCount > 0) {
-                    throw new RuntimeException("请删除该目录下文件后重试");
-                }
-            }
-            
-            // 使用 LambdaUpdateWrapper 明确指定要更新的字段
+        if (file == null || !file.getUserId().equals(userId)) return;
+        
+        if (file.getIsFolder() != null && file.getIsFolder() == 1) {
+            // 文件夹：递归将所有子文件标记删除，移动到回收站根目录
+            moveChildrenToTrash(id, userId);
+        }
+        
+        // 当前文件/文件夹：移动到回收站根目录
+        LambdaUpdateWrapper<FileEntity> wrapper = new LambdaUpdateWrapper<>();
+        wrapper.eq(FileEntity::getId, id)
+               .set(FileEntity::getFolderId, 0L)
+               .set(FileEntity::getIsDeleted, 1)
+               .set(FileEntity::getDeletedAt, LocalDateTime.now().format(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")));
+        fileMapper.update(null, wrapper);
+    }
+    
+    /**
+     * 递归将文件夹下所有子文件/子文件夹标记为删除（folderId 保持不变）
+     */
+    private void moveChildrenToTrash(Long parentFolderId, Long userId) {
+        List<FileEntity> children = fileMapper.selectList(
+            new LambdaQueryWrapper<FileEntity>()
+                .eq(FileEntity::getFolderId, parentFolderId)
+                .eq(FileEntity::getIsDeleted, 0)
+                .eq(FileEntity::getUserId, userId)
+        );
+        
+        for (FileEntity child : children) {
+            // 子文件/子文件夹只标删除，folderId 保持原值不变
             LambdaUpdateWrapper<FileEntity> wrapper = new LambdaUpdateWrapper<>();
-            wrapper.eq(FileEntity::getId, id)
+            wrapper.eq(FileEntity::getId, child.getId())
                    .set(FileEntity::getIsDeleted, 1)
                    .set(FileEntity::getDeletedAt, LocalDateTime.now().format(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")));
             fileMapper.update(null, wrapper);
+            
+            if (child.getIsFolder() != null && child.getIsFolder() == 1) {
+                // 递归处理子文件夹
+                moveChildrenToTrash(child.getId(), userId);
+            }
         }
     }
     
@@ -121,21 +142,29 @@ public class FileService {
         FileEntity file = fileMapper.selectById(id);
         if (file == null || !file.getUserId().equals(userId)) return;
         
-        // 检查父文件夹是否在回收站，如果是，将文件移到根目录
-        Long folderId = file.getFolderId();
-        if (folderId != null) {
-            FileEntity parentFolder = fileMapper.selectById(folderId);
-            if (parentFolder != null && parentFolder.getIsDeleted() == 1) {
-                // 父文件夹在回收站，将文件移到根目录
-                folderId = null;
+        // 检查父文件夹状态，决定还原目标
+        // - folderId == 0 或 null：根目录，还原到根目录（folderId=0）
+        // - 父文件夹存在且未删除：还原到原父文件夹
+        // - 父文件夹不存在或已删除：还原到根目录（folderId=0）
+        Long originalFolderId = file.getFolderId();
+        Long targetFolderId = originalFolderId;
+        
+        if (targetFolderId != null && !targetFolderId.equals(0L)) {
+            FileEntity parentFolder = fileMapper.selectById(targetFolderId);
+            if (parentFolder == null || parentFolder.getIsDeleted() == 1) {
+                // 父文件夹不在了，还原到根目录
+                targetFolderId = 0L;
             }
+        } else if (targetFolderId == null || targetFolderId.equals(0L)) {
+            // 本身就是根目录
+            targetFolderId = 0L;
         }
         
         LambdaUpdateWrapper<FileEntity> wrapper = new LambdaUpdateWrapper<>();
         wrapper.eq(FileEntity::getId, id)
                .set(FileEntity::getIsDeleted, 0)
                .set(FileEntity::getDeletedAt, null)
-               .set(FileEntity::getFolderId, folderId);
+               .set(FileEntity::getFolderId, targetFolderId);
         fileMapper.update(null, wrapper);
         
         // 如果是文件夹，递归还原所有子文件
@@ -169,28 +198,9 @@ public class FileService {
         FileEntity file = fileMapper.selectById(id);
         if (file == null || !file.getUserId().equals(userId)) return;
         
-        // 如果是文件夹，检查是否有未删除的子文件
         if (file.getIsFolder() != null && file.getIsFolder() == 1) {
-            Long undeletedCount = fileMapper.selectCount(
-                new LambdaQueryWrapper<FileEntity>()
-                    .eq(FileEntity::getFolderId, id)
-                    .eq(FileEntity::getIsDeleted, 0)
-                    .eq(FileEntity::getUserId, userId)
-            );
-            if (undeletedCount != null && undeletedCount > 0) {
-                throw new RuntimeException("请先处理该目录下的子文件后重试");
-            }
-            
-            // 检查是否有已删除的子文件（在回收站里的）
-            Long deletedChildrenCount = fileMapper.selectCount(
-                new LambdaQueryWrapper<FileEntity>()
-                    .eq(FileEntity::getFolderId, id)
-                    .eq(FileEntity::getIsDeleted, 1)
-                    .eq(FileEntity::getUserId, userId)
-            );
-            if (deletedChildrenCount != null && deletedChildrenCount > 0) {
-                throw new RuntimeException("请先处理该目录下的子文件后重试");
-            }
+            // 递归彻底删除所有子文件/子文件夹
+            deleteChildrenPermanently(id, userId);
         }
         
         // 删除当前文件的物理文件并扣减存储
@@ -208,11 +218,58 @@ public class FileService {
         fileMapper.deleteById(id);
     }
     
+    /**
+     * 递归彻底删除文件夹下所有子文件/子文件夹
+     */
+    private void deleteChildrenPermanently(Long parentFolderId, Long userId) {
+        List<FileEntity> children = fileMapper.selectList(
+            new LambdaQueryWrapper<FileEntity>()
+                .eq(FileEntity::getFolderId, parentFolderId)
+                .eq(FileEntity::getIsDeleted, 1)
+                .eq(FileEntity::getUserId, userId)
+        );
+        
+        for (FileEntity child : children) {
+            if (child.getIsFolder() != null && child.getIsFolder() == 1) {
+                deleteChildrenPermanently(child.getId(), userId);
+            }
+            
+            // 删除物理文件并扣减存储
+            if (child.getPath() != null && !child.getPath().isEmpty()) {
+                try {
+                    Path filePath = Paths.get(storagePath).toAbsolutePath().resolve("files").resolve(child.getPath());
+                    Files.deleteIfExists(filePath);
+                } catch (IOException e) {
+                    // ignore
+                }
+                if (child.getSize() != null && child.getSize() > 0) {
+                    userService.decreaseStorage(userId, child.getSize());
+                }
+            }
+            fileMapper.deleteById(child.getId());
+        }
+    }
+    
     @Transactional
     public void emptyTrash(Long userId) {
         List<FileEntity> trashFiles = getTrashFiles(userId, null);
+        
+        // 找出回收站里所有文件夹的 ID
+        java.util.Set<Long> folderIds = trashFiles.stream()
+            .filter(f -> f.getIsFolder() != null && f.getIsFolder() == 1)
+            .map(FileEntity::getId)
+            .collect(java.util.stream.Collectors.toSet());
+        
         for (FileEntity file : trashFiles) {
-            deletePermanently(file.getId(), userId);
+            // 跳过子文件（folderId 指向的父文件夹也在回收站中，会被级联删除）
+            if (folderIds.contains(file.getFolderId())) {
+                continue;
+            }
+            try {
+                deletePermanently(file.getId(), userId);
+            } catch (Exception e) {
+                // ignore，级联删除时子文件可能已不存在
+            }
         }
     }
     
@@ -223,7 +280,8 @@ public class FileService {
         folder.setType("folder");
         folder.setIsFolder(1);
         folder.setUserId(userId);
-        folder.setFolderId(parentId);
+        // 根目录 parentId = null 或 0 → 统一用 0
+        folder.setFolderId((parentId == null || parentId == 0L) ? 0L : parentId);
         folder.setSize(0L);
         folder.setIsShared(0);
         folder.setIsDeleted(0);
@@ -498,8 +556,13 @@ public class FileService {
             throw new RuntimeException("无法移动回收站中的文件");
         }
         
-        // 检查目标文件夹是否存在（如果不是根目录）
-        if (targetFolderId != null) {
+        // 规范化 targetFolderId：null → 0L（根目录）
+        if (targetFolderId == null) {
+            targetFolderId = 0L;
+        }
+        
+        // 检查目标文件夹是否存在（如果不是根目录，folderId=0 视为根目录）
+        if (!targetFolderId.equals(0L)) {
             FileEntity targetFolder = fileMapper.selectById(targetFolderId);
             if (targetFolder == null) {
                 throw new RuntimeException("目标文件夹不存在");
@@ -529,20 +592,22 @@ public class FileService {
         }
         
         // 检查目标位置是否已有同名文件
-        FileEntity existing = fileMapper.selectOne(
-            new LambdaQueryWrapper<FileEntity>()
-                .eq(FileEntity::getUserId, userId)
-                .eq(FileEntity::getFolderId, targetFolderId)
-                .eq(FileEntity::getName, file.getName())
-                .eq(FileEntity::getIsDeleted, 0)
-                .ne(FileEntity::getId, fileId)
-        );
+        LambdaQueryWrapper<FileEntity> dupWrapper = new LambdaQueryWrapper<FileEntity>()
+            .eq(FileEntity::getUserId, userId)
+            .eq(FileEntity::getName, file.getName())
+            .eq(FileEntity::getIsDeleted, 0)
+            .ne(FileEntity::getId, fileId);
+        
+        // targetFolderId 为 null 或 0 → 根目录，统一用 eq(0L)
+        Long actualTarget = (targetFolderId == null || targetFolderId == 0L) ? 0L : targetFolderId;
+        dupWrapper.eq(FileEntity::getFolderId, actualTarget);
+        
+        FileEntity existing = fileMapper.selectOne(dupWrapper);
         if (existing != null) {
             throw new RuntimeException("目标位置已存在同名文件");
         }
         
-        file.setFolderId(targetFolderId);
-        // 使用直接更新确保 null 值也能被设置
+        // 使用直接更新，folderId=0 表示根目录，null 表示"我的文档"原始状态（已在 moveToTrash 时处理）
         fileMapper.update(null,
             new LambdaUpdateWrapper<FileEntity>()
                 .eq(FileEntity::getId, fileId)
@@ -700,9 +765,13 @@ public class FileService {
     private List<FileEntity> buildFolderTree(List<FileEntity> allFolders, Long parentId, List<Long> excludeIds) {
         List<FileEntity> tree = new ArrayList<>();
         for (FileEntity folder : allFolders) {
-            // 匹配父级关系
-            boolean isChildOfParent = (parentId == null && folder.getFolderId() == null) 
-                || (parentId != null && parentId.equals(folder.getFolderId()));
+            // 匹配父级关系：parentId == null 或 0 都视为根目录，匹配 folderId == 0 的文件夹
+            boolean isChildOfParent;
+            if (parentId == null || parentId == 0L) {
+                isChildOfParent = (folder.getFolderId() != null && folder.getFolderId() == 0L);
+            } else {
+                isChildOfParent = parentId.equals(folder.getFolderId());
+            }
             
             if (isChildOfParent) {
                 // 递归构建子文件夹
diff --git a/web-vue/src/components/BatchMoveDialog.vue b/web-vue/src/components/BatchMoveDialog.vue
index 13b5ece..61d3c6b 100644
--- a/web-vue/src/components/BatchMoveDialog.vue
+++ b/web-vue/src/components/BatchMoveDialog.vue
@@ -50,7 +50,7 @@ const visible = computed({
   set: (val) => emit('update:modelValue', val)
 })
 
-const targetFolderId = ref(null)
+const targetFolderId = ref(0)
 
 // 树形配置
 const treeProps = {
@@ -64,7 +64,7 @@ const folderTreeData = computed(() => {
   // 根节点
   const rootNodes = [
     {
-      id: 'root',
+      id: 0,
       name: '根目录',
       children: []
     }
@@ -90,20 +90,21 @@ const folderTreeData = computed(() => {
 })
 
 const handleConfirm = () => {
+  // targetFolderId = 0 表示根目录，null 表示未选择
   emit('confirm', targetFolderId.value)
   visible.value = false
-  targetFolderId.value = null
+  targetFolderId.value = 0
 }
 
 const open = () => {
-  targetFolderId.value = null
+  targetFolderId.value = 0
   visible.value = true
 }
 
 // 重置选中状态
 watch(visible, (val) => {
   if (!val) {
-    targetFolderId.value = null
+    targetFolderId.value = 0
   }
 })
 
diff --git a/web-vue/src/views/files/index.vue b/web-vue/src/views/files/index.vue
index 33da2e4..e284def 100644
--- a/web-vue/src/views/files/index.vue
+++ b/web-vue/src/views/files/index.vue
@@ -623,14 +623,8 @@ const handleBatchMove = async () => {
 }
 
 const handleConfirmBatchMove = async (targetFolderId) => {
-  // Handle target folder ID
-  let finalFolderId = null
-  
-  if (targetFolderId === 'root' || targetFolderId === '' || targetFolderId === null || targetFolderId === undefined) {
-    finalFolderId = null
-  } else {
-    finalFolderId = targetFolderId
-  }
+  // targetFolderId = 0 表示根目录，null 表示未选择（此时用 0 作为默认值）
+  let finalFolderId = (targetFolderId === null || targetFolderId === undefined) ? 0 : targetFolderId
   
   let successCount = 0
   let failCount = 0