diff --git a/src/Infrastructure/TakeoutSaaS.Infrastructure/Identity/Repositories/EfMenuRepository.cs b/src/Infrastructure/TakeoutSaaS.Infrastructure/Identity/Repositories/EfMenuRepository.cs
index 97167ef..fcacf21 100644
--- a/src/Infrastructure/TakeoutSaaS.Infrastructure/Identity/Repositories/EfMenuRepository.cs
+++ b/src/Infrastructure/TakeoutSaaS.Infrastructure/Identity/Repositories/EfMenuRepository.cs
@@ -10,30 +10,52 @@ namespace TakeoutSaaS.Infrastructure.Identity.Repositories;
 /// </summary>
 public sealed class EfMenuRepository(IdentityDbContext dbContext) : IMenuRepository
 {
-    private const long PlatformRootTenantId = 1000000000001;
-
     /// <inheritdoc />
-    public Task<IReadOnlyList<MenuDefinition>> GetByTenantAsync(long tenantId, CancellationToken cancellationToken = default)
+    public async Task<IReadOnlyList<MenuDefinition>> GetByTenantAsync(long tenantId, CancellationToken cancellationToken = default)
     {
-        return dbContext.MenuDefinitions
+        // 1. 优先返回租户自定义菜单
+        var tenantMenus = await dbContext.MenuDefinitions
             .AsNoTracking()
-            .IgnoreQueryFilters()
-            .Where(x => x.TenantId == PlatformRootTenantId && x.DeletedAt == null)
+            .Where(x => x.TenantId == tenantId)
             .OrderBy(x => x.ParentId)
             .ThenBy(x => x.SortOrder)
-            .ToListAsync(cancellationToken)
-            .ContinueWith(t => (IReadOnlyList<MenuDefinition>)t.Result, cancellationToken);
+            .ToListAsync(cancellationToken);
+        if (tenantMenus.Count > 0)
+        {
+            return tenantMenus;
+        }
+
+        // 2. (空行后) 回退系统默认菜单（TenantId=0）
+        var systemMenus = await dbContext.MenuDefinitions
+            .AsNoTracking()
+            .IgnoreQueryFilters()
+            .Where(x => x.TenantId == 0 && x.DeletedAt == null)
+            .OrderBy(x => x.ParentId)
+            .ThenBy(x => x.SortOrder)
+            .ToListAsync(cancellationToken);
+
+        return systemMenus;
     }
 
     /// <inheritdoc />
-    public Task<MenuDefinition?> FindByIdAsync(long id, long tenantId, CancellationToken cancellationToken = default)
+    public async Task<MenuDefinition?> FindByIdAsync(long id, long tenantId, CancellationToken cancellationToken = default)
     {
-        return dbContext.MenuDefinitions
+        // 1. 优先查租户菜单
+        var tenantMenu = await dbContext.MenuDefinitions
+            .AsNoTracking()
+            .FirstOrDefaultAsync(
+                x => x.Id == id && x.TenantId == tenantId,
+                cancellationToken);
+        if (tenantMenu != null)
+        {
+            return tenantMenu;
+        }
+
+        // 2. (空行后) 回退查系统默认菜单（TenantId=0）
+        return await dbContext.MenuDefinitions
             .AsNoTracking()
             .IgnoreQueryFilters()
-            .FirstOrDefaultAsync(
-                x => x.Id == id && x.TenantId == PlatformRootTenantId && x.DeletedAt == null,
-                cancellationToken);
+            .FirstOrDefaultAsync(x => x.Id == id && x.TenantId == 0 && x.DeletedAt == null, cancellationToken);
     }
 
     /// <inheritdoc />