diff --git a/modules/blogging/src/Volo.Blogging.Application.Contracts/Volo/Blogging/Comments/Dtos/CommentDto.cs b/modules/blogging/src/Volo.Blogging.Application.Contracts/Volo/Blogging/Comments/Dtos/CommentDto.cs
index b89c964c27..f43b7f552b 100644
--- a/modules/blogging/src/Volo.Blogging.Application.Contracts/Volo/Blogging/Comments/Dtos/CommentDto.cs
+++ b/modules/blogging/src/Volo.Blogging.Application.Contracts/Volo/Blogging/Comments/Dtos/CommentDto.cs
@@ -5,7 +5,7 @@ namespace Volo.Blogging.Comments.Dtos
 {
     public class CommentDto : FullAuditedEntityDto<Guid>
     {
-        public Guid RepliedCommentId { get; set; }
+        public Guid? RepliedCommentId { get; set; }
 
         public string Text { get; set; }
     }
diff --git a/modules/blogging/src/Volo.Blogging.Application.Contracts/Volo/Blogging/Comments/ICommentAppService.cs b/modules/blogging/src/Volo.Blogging.Application.Contracts/Volo/Blogging/Comments/ICommentAppService.cs
index 2b27c67ca4..32b4f4cd18 100644
--- a/modules/blogging/src/Volo.Blogging.Application.Contracts/Volo/Blogging/Comments/ICommentAppService.cs
+++ b/modules/blogging/src/Volo.Blogging.Application.Contracts/Volo/Blogging/Comments/ICommentAppService.cs
@@ -8,8 +8,6 @@ namespace Volo.Blogging.Comments
 {
     public interface ICommentAppService : IApplicationService
     {
-        Task<List<CommentDto>> GetListOfPostAsync(GetCommentListOfPostAsync input);
-
         Task<List<CommentWithRepliesDto>> GetHierarchicalListOfPostAsync(GetCommentListOfPostAsync input);
 
         Task<CommentDto> CreateAsync(CreateCommentDto input);
diff --git a/modules/blogging/src/Volo.Blogging.Application/Volo/Blogging/Comments/CommentAppService.cs b/modules/blogging/src/Volo.Blogging.Application/Volo/Blogging/Comments/CommentAppService.cs
index a3e17bc109..02dee1b1ca 100644
--- a/modules/blogging/src/Volo.Blogging.Application/Volo/Blogging/Comments/CommentAppService.cs
+++ b/modules/blogging/src/Volo.Blogging.Application/Volo/Blogging/Comments/CommentAppService.cs
@@ -9,7 +9,7 @@ using Volo.Blogging.Comments.Dtos;
 
 namespace Volo.Blogging.Comments
 {
-  //  [Authorize(BloggingPermissions.Comments.Default)]
+    //  [Authorize(BloggingPermissions.Comments.Default)]
     public class CommentAppService : ApplicationService, ICommentAppService
     {
         private readonly ICommentRepository _commentRepository;
@@ -42,15 +42,10 @@ namespace Volo.Blogging.Comments
 
             hierarchicalComments = hierarchicalComments.OrderByDescending(c => c.Comment.CreationTime).ToList();
 
-            foreach (var hierarchicalComment in hierarchicalComments)
-            {
-                hierarchicalComment.Replies = hierarchicalComment.Replies.OrderBy(c => c.CreationTime).ToList();
-            }
-
             return hierarchicalComments;
         }
 
-        public async Task<List<CommentDto>> GetListOfPostAsync(GetCommentListOfPostAsync input)
+        private async Task<List<CommentDto>> GetListOfPostAsync(GetCommentListOfPostAsync input)
         {
             var comments = await _commentRepository.GetListOfPostAsync(input.PostId);
 
diff --git a/modules/blogging/src/Volo.Blogging.Application/Volo/Blogging/Posts/PostAppService.cs b/modules/blogging/src/Volo.Blogging.Application/Volo/Blogging/Posts/PostAppService.cs
index f39f9f369e..baf14fa8f7 100644
--- a/modules/blogging/src/Volo.Blogging.Application/Volo/Blogging/Posts/PostAppService.cs
+++ b/modules/blogging/src/Volo.Blogging.Application/Volo/Blogging/Posts/PostAppService.cs
@@ -41,11 +41,7 @@ namespace Volo.Blogging.Posts
 
             foreach (var postDto in postDtos)
             {
-                var tagIds = (await _postTagRepository.GetListAsync()).Where(pt => pt.PostId == postDto.Id);
-
-                var tags = await _tagRepository.GetListAsync(tagIds.Select(t => t.TagId));
-
-                postDto.Tags = ObjectMapper.Map<List<Tag>, List<TagDto>>(tags);
+                postDto.Tags = await GetTagsOfPost(postDto);
 
                 postDto.CommentCount = (await _commentRepository.GetListAsync()).Count(p => p.PostId == postDto.Id);
             }
@@ -67,11 +63,7 @@ namespace Volo.Blogging.Posts
 
             var postDto = ObjectMapper.Map<Post, PostWithDetailsDto>(post);
 
-            var tagIds = (await _postTagRepository.GetListAsync()).Where(pt => pt.PostId == postDto.Id);
-
-            var tags = await _tagRepository.GetListAsync(tagIds.Select(t => t.TagId));
-
-            postDto.Tags = ObjectMapper.Map<List<Tag>, List<TagDto>>(tags);
+            postDto.Tags = await GetTagsOfPost(postDto);
 
             return postDto;
         }
@@ -82,11 +74,7 @@ namespace Volo.Blogging.Posts
 
             var postDto = ObjectMapper.Map<Post, PostWithDetailsDto>(post);
 
-            var tagIds = (await _postTagRepository.GetListAsync()).Where(pt => pt.PostId == postDto.Id);
-
-            var tags = await _tagRepository.GetListAsync(tagIds.Select(t => t.TagId));
-
-            postDto.Tags = ObjectMapper.Map<List<Tag>, List<TagDto>>(tags);
+            postDto.Tags = await GetTagsOfPost(postDto);
 
             return postDto;
         }
@@ -162,6 +150,15 @@ namespace Volo.Blogging.Posts
 
         }
 
+        private async Task<List<TagDto>> GetTagsOfPost(PostWithDetailsDto postDto)
+        {
+            var tagIds = (await _postTagRepository.GetListAsync()).Where(pt => pt.PostId == postDto.Id);
+
+            var tags = await _tagRepository.GetListAsync(tagIds.Select(t => t.TagId));
+
+            return ObjectMapper.Map<List<Tag>, List<TagDto>>(tags);
+        }
+
         private List<string> SplitTags(string tags)
         {
             if (tags.IsNullOrWhiteSpace())