diff --git a/src/backend/BookmarkApi.Core/Services/BookmarkService.cs b/src/backend/BookmarkApi.Core/Services/BookmarkService.cs
index de46a00..f255b05 100644
--- a/src/backend/BookmarkApi.Core/Services/BookmarkService.cs
+++ b/src/backend/BookmarkApi.Core/Services/BookmarkService.cs
@@ -21,61 +21,58 @@ public class BookmarkService : IBookmarkService
     /// <inheritdoc />
     public async Task<List<BookmarkDto>> GetUserBookmarksAsync(Guid userId, Guid deviceId, bool isAdminDevice, string? tag = null)
     {
-        var query = _freeSql.Select<Bookmark>()
-            .Where(b => b.UserId == userId);
+        // 先查询所有书签，然后在内存中过滤
+        // 避免 FreeSql 无法正确转换 AllowedDevices.Contains 和 Tags.Contains 为 SQL
+        var bookmarks = await _freeSql.Select<Bookmark>()
+            .Where(b => b.UserId == userId)
+            .OrderByDescending(b => b.Order)
+            .ToListAsync();
 
         // 如果不是管理员设备，需要过滤可见性
         if (!isAdminDevice)
         {
-            query = query.Where(b =>
+            bookmarks = bookmarks.Where(b =>
                 b.Visibility == VisibilityType.Public ||
                 (b.Visibility == VisibilityType.Specified && b.AllowedDevices != null && b.AllowedDevices.Contains(deviceId))
-            );
+            ).ToList();
         }
 
         // 按标签筛选
         if (!string.IsNullOrEmpty(tag))
         {
-            query = query.Where(b => b.Tags.Contains(tag));
+            bookmarks = bookmarks.Where(b => b.Tags.Contains(tag)).ToList();
         }
 
-        var bookmarks = await query
-            .OrderByDescending(b => b.Order)
-            .ToListAsync();
-
         return bookmarks.Select(MapToDto).ToList();
     }
 
     /// <inheritdoc />
     public async Task<List<BookmarkDto>> SearchBookmarksAsync(Guid userId, Guid deviceId, bool isAdminDevice, string keyword)
     {
-        var query = _freeSql.Select<Bookmark>()
-            .Where(b => b.UserId == userId);
+        // 先在数据库层面进行关键词搜索，然后在内存中过滤可见性
+        // 避免 FreeSql 无法正确转换 AllowedDevices.Contains 为 SQL
+        var lowerKeyword = keyword.ToLower();
+        var bookmarks = await _freeSql.Select<Bookmark>()
+            .Where(b => b.UserId == userId)
+            .Where(b =>
+                b.Title.ToLower().Contains(lowerKeyword) ||
+                b.Url.ToLower().Contains(lowerKeyword) ||
+                (b.Description != null && b.Description.ToLower().Contains(lowerKeyword))
+            )
+            .OrderByDescending(b => b.VisitCount)
+            .OrderByDescending(b => b.Order)
+            .ToListAsync();
 
         // 如果不是管理员设备，需要过滤可见性
         if (!isAdminDevice)
         {
-            query = query.Where(b =>
+            bookmarks = bookmarks.Where(b =>
                 b.Visibility == VisibilityType.Public ||
                 (b.Visibility == VisibilityType.Specified && b.AllowedDevices != null && b.AllowedDevices.Contains(deviceId))
-            );
+            ).ToList();
         }
 
-        // 搜索关键词
-        var lowerKeyword = keyword.ToLower();
-        query = query.Where(b =>
-            b.Title.ToLower().Contains(lowerKeyword) ||
-            b.Url.ToLower().Contains(lowerKeyword) ||
-            (b.Description != null && b.Description.ToLower().Contains(lowerKeyword))
-        );
-
-        var bookmarks = await query
-            .OrderByDescending(b => b.VisitCount)
-            .OrderByDescending(b => b.Order)
-            .Take(20)
-            .ToListAsync();
-
-        return bookmarks.Select(MapToDto).ToList();
+        return bookmarks.Take(20).Select(MapToDto).ToList();
     }
 
     /// <inheritdoc />
diff --git a/src/backend/BookmarkApi.Core/Services/TagService.cs b/src/backend/BookmarkApi.Core/Services/TagService.cs
index fc7c4b3..8e5f733 100644
--- a/src/backend/BookmarkApi.Core/Services/TagService.cs
+++ b/src/backend/BookmarkApi.Core/Services/TagService.cs
@@ -20,20 +20,21 @@ public class TagService : ITagService
     /// <inheritdoc />
     public async Task<List<TagDto>> GetUserTagsAsync(Guid userId, Guid deviceId, bool isAdminDevice)
     {
-        var query = _freeSql.Select<Bookmark>()
-            .Where(b => b.UserId == userId);
+        // 先查询所有书签，然后在内存中过滤
+        // 避免 FreeSql 无法正确转换 AllowedDevices.Contains 为 SQL
+        var bookmarks = await _freeSql.Select<Bookmark>()
+            .Where(b => b.UserId == userId)
+            .ToListAsync();
 
         // 如果不是管理员设备，需要过滤可见性
         if (!isAdminDevice)
         {
-            query = query.Where(b =>
+            bookmarks = bookmarks.Where(b =>
                 b.Visibility == VisibilityType.Public ||
                 (b.Visibility == VisibilityType.Specified && b.AllowedDevices != null && b.AllowedDevices.Contains(deviceId))
-            );
+            ).ToList();
         }
 
-        var bookmarks = await query.ToListAsync();
-
         // 统计标签使用数量
         var tagCounts = new Dictionary<string, int>();