diff --git a/modules/blogging/src/Volo.Blogging.Application.Contracts/Volo/Blogging/Posts/CreatePostDto.cs b/modules/blogging/src/Volo.Blogging.Application.Contracts/Volo/Blogging/Posts/CreatePostDto.cs
index 9c55f9e265..21077a4912 100644
--- a/modules/blogging/src/Volo.Blogging.Application.Contracts/Volo/Blogging/Posts/CreatePostDto.cs
+++ b/modules/blogging/src/Volo.Blogging.Application.Contracts/Volo/Blogging/Posts/CreatePostDto.cs
@@ -11,7 +11,6 @@ namespace Volo.Blogging.Posts
         [StringLength(PostConsts.MaxTitleLength)]
         public string Title { get; set; }
 
-
         [Required]
         [StringLength(PostConsts.MaxUrlLength)]
         public string Url { get; set; }
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 baf14fa8f7..3e3089b88d 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
@@ -43,7 +43,7 @@ namespace Volo.Blogging.Posts
             {
                 postDto.Tags = await GetTagsOfPost(postDto);
 
-                postDto.CommentCount = (await _commentRepository.GetListAsync()).Count(p => p.PostId == postDto.Id);
+                postDto.CommentCount = await _commentRepository.GetCommentCountOfPostAsync(postDto.Id);
             }
 
             if (!tagName.IsNullOrWhiteSpace())
@@ -116,19 +116,39 @@ namespace Volo.Blogging.Posts
         }
 
         private async Task SaveTags(List<String> newTags, Post post)
+        {
+
+            await RemoveOldTags(newTags, post);
+
+            await AddNewTags(newTags, post);
+        }
+
+        private async Task RemoveOldTags(List<string> newTags, Post post)
         {
             var oldTags = (await _postTagRepository.GetListAsync()).Where(pt => pt.PostId == post.Id).ToList();
 
             foreach (var oldTag in oldTags)
             {
-                await _postTagRepository.DeleteAsync(oldTag);
-
                 var tag = await _tagRepository.GetAsync(oldTag.TagId);
 
-                tag.DecreaseUsageCount();
-                await _tagRepository.UpdateAsync(tag);
+                var oldTagNameInNewTags = newTags.FirstOrDefault(t => t == tag.Name);
+
+                if (oldTagNameInNewTags == null)
+                {
+                    await _postTagRepository.DeleteAsync(oldTag);
+
+                    tag.DecreaseUsageCount();
+                    await _tagRepository.UpdateAsync(tag);
+                }
+                else
+                {
+                    newTags.Remove(oldTagNameInNewTags);
+                }
             }
+        }
 
+        private async Task AddNewTags(List<string> newTags, Post post)
+        {
             var tags = await _tagRepository.GetListAsync();
 
             foreach (var newTag in newTags)
@@ -147,7 +167,6 @@ namespace Volo.Blogging.Posts
 
                 await _postTagRepository.InsertAsync(new PostTag(post.Id, tag.Id));
             }
-
         }
 
         private async Task<List<TagDto>> GetTagsOfPost(PostWithDetailsDto postDto)
diff --git a/modules/blogging/src/Volo.Blogging.Domain/Volo/Blogging/Comments/ICommentRepository.cs b/modules/blogging/src/Volo.Blogging.Domain/Volo/Blogging/Comments/ICommentRepository.cs
index fb91a7816e..41ee3e0c05 100644
--- a/modules/blogging/src/Volo.Blogging.Domain/Volo/Blogging/Comments/ICommentRepository.cs
+++ b/modules/blogging/src/Volo.Blogging.Domain/Volo/Blogging/Comments/ICommentRepository.cs
@@ -11,6 +11,8 @@ namespace Volo.Blogging.Comments
             Guid postId
         );
 
+        Task<int> GetCommentCountOfPostAsync(Guid postId);
+
         Task<List<Comment>> GetRepliesOfComment(Guid id);
     }
 }
diff --git a/modules/blogging/src/Volo.Blogging.EntityFrameworkCore/Volo/Blogging/Comments/EfCoreCommentRepository.cs b/modules/blogging/src/Volo.Blogging.EntityFrameworkCore/Volo/Blogging/Comments/EfCoreCommentRepository.cs
index 3713d0464d..c463a4fd08 100644
--- a/modules/blogging/src/Volo.Blogging.EntityFrameworkCore/Volo/Blogging/Comments/EfCoreCommentRepository.cs
+++ b/modules/blogging/src/Volo.Blogging.EntityFrameworkCore/Volo/Blogging/Comments/EfCoreCommentRepository.cs
@@ -24,6 +24,12 @@ namespace Volo.Blogging.Comments
                 .ToListAsync();
         }
 
+        public async Task<int> GetCommentCountOfPostAsync(Guid postId)
+        {
+            return await DbSet
+                .CountAsync(a => a.PostId == postId);
+        }
+
         public async Task<List<Comment>> GetRepliesOfComment(Guid id)
         {
             return await DbSet
diff --git a/modules/blogging/src/Volo.Blogging.Web/Areas/Blog/Controllers/CommentsController.cs b/modules/blogging/src/Volo.Blogging.Web/Areas/Blog/Controllers/CommentsController.cs
index 4c8176351d..89ed0f1968 100644
--- a/modules/blogging/src/Volo.Blogging.Web/Areas/Blog/Controllers/CommentsController.cs
+++ b/modules/blogging/src/Volo.Blogging.Web/Areas/Blog/Controllers/CommentsController.cs
@@ -1,6 +1,4 @@
 using System;
-using System.Collections.Generic;
-using System.Linq;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Mvc;
 using Volo.Abp.AspNetCore.Mvc;