diff --git a/modules/cms-kit/src/Volo.CmsKit.Admin.Application/Volo/CmsKit/Admin/Blogs/BlogPostAdminAppService.cs b/modules/cms-kit/src/Volo.CmsKit.Admin.Application/Volo/CmsKit/Admin/Blogs/BlogPostAdminAppService.cs
index d2c1114dfb..ee5ed3e126 100644
--- a/modules/cms-kit/src/Volo.CmsKit.Admin.Application/Volo/CmsKit/Admin/Blogs/BlogPostAdminAppService.cs
+++ b/modules/cms-kit/src/Volo.CmsKit.Admin.Application/Volo/CmsKit/Admin/Blogs/BlogPostAdminAppService.cs
@@ -1,5 +1,6 @@
 using Microsoft.AspNetCore.Authorization;
 using System;
+using System.Diagnostics.CodeAnalysis;
 using System.Threading.Tasks;
 using Volo.Abp.Application.Dtos;
 using Volo.Abp.Application.Services;
diff --git a/modules/cms-kit/src/Volo.CmsKit.Public.Application.Contracts/Volo/CmsKit/Public/Blogs/IBlogPostPublicAppService.cs b/modules/cms-kit/src/Volo.CmsKit.Public.Application.Contracts/Volo/CmsKit/Public/Blogs/IBlogPostPublicAppService.cs
index 0c9079ee7e..04234b4f06 100644
--- a/modules/cms-kit/src/Volo.CmsKit.Public.Application.Contracts/Volo/CmsKit/Public/Blogs/IBlogPostPublicAppService.cs
+++ b/modules/cms-kit/src/Volo.CmsKit.Public.Application.Contracts/Volo/CmsKit/Public/Blogs/IBlogPostPublicAppService.cs
@@ -1,4 +1,5 @@
-using System;
+using JetBrains.Annotations;
+using System;
 using System.Collections.Generic;
 using System.Threading.Tasks;
 using Volo.Abp.Application.Dtos;
@@ -8,9 +9,9 @@ namespace Volo.CmsKit.Public.Blogs
 {
     public interface IBlogPostPublicAppService
     {
-        Task<PagedResultDto<BlogPostPublicDto>> GetListAsync(string blogSlug, PagedAndSortedResultRequestDto input);
+        Task<PagedResultDto<BlogPostPublicDto>> GetListAsync([NotNull] string blogSlug, PagedAndSortedResultRequestDto input);
 
-        Task<BlogPostPublicDto> GetAsync(string blogSlug, string blogPostSlug);
+        Task<BlogPostPublicDto> GetAsync([NotNull] string blogSlug, [NotNull] string blogPostSlug);
 
         Task<RemoteStreamContent> GetCoverImageAsync(Guid id);
     }
diff --git a/modules/cms-kit/src/Volo.CmsKit.Public.Application/Volo/CmsKit/Public/Blogs/BlogPostPublicAppService.cs b/modules/cms-kit/src/Volo.CmsKit.Public.Application/Volo/CmsKit/Public/Blogs/BlogPostPublicAppService.cs
index 3994720d73..644b4e4cc3 100644
--- a/modules/cms-kit/src/Volo.CmsKit.Public.Application/Volo/CmsKit/Public/Blogs/BlogPostPublicAppService.cs
+++ b/modules/cms-kit/src/Volo.CmsKit.Public.Application/Volo/CmsKit/Public/Blogs/BlogPostPublicAppService.cs
@@ -1,4 +1,5 @@
-using System;
+using JetBrains.Annotations;
+using System;
 using System.Collections.Generic;
 using System.Threading.Tasks;
 using Volo.Abp.Application.Dtos;
@@ -26,7 +27,7 @@ namespace Volo.CmsKit.Public.Blogs
             BlobContainer = blobContainer;
         }
 
-        public async Task<BlogPostPublicDto> GetAsync(string blogSlug, string blogPostSlug)
+        public virtual async Task<BlogPostPublicDto> GetAsync([NotNull] string blogSlug, [NotNull] string blogPostSlug)
         {
             var blog = await BlogRepository.GetBySlugAsync(blogSlug);
 
@@ -35,7 +36,7 @@ namespace Volo.CmsKit.Public.Blogs
             return ObjectMapper.Map<BlogPost, BlogPostPublicDto>(blogPost);
         }
 
-        public async Task<PagedResultDto<BlogPostPublicDto>> GetListAsync(string blogSlug, PagedAndSortedResultRequestDto input)
+        public virtual async Task<PagedResultDto<BlogPostPublicDto>> GetListAsync([NotNull] string blogSlug, PagedAndSortedResultRequestDto input)
         {
             var blog = await BlogRepository.GetBySlugAsync(blogSlug);
 
@@ -46,7 +47,7 @@ namespace Volo.CmsKit.Public.Blogs
                 ObjectMapper.Map<List<BlogPost>, List<BlogPostPublicDto>>(blogPosts));
         }
 
-        public async Task<RemoteStreamContent> GetCoverImageAsync(Guid id)
+        public virtual async Task<RemoteStreamContent> GetCoverImageAsync(Guid id)
         {
             var stream = await BlobContainer.GetAsync(id.ToString());