diff --git a/open-isle-cli/src/views/PostPageView.vue b/open-isle-cli/src/views/PostPageView.vue
index eaf2e551c..b6e313861 100644
--- a/open-isle-cli/src/views/PostPageView.vue
+++ b/open-isle-cli/src/views/PostPageView.vue
@@ -69,7 +69,7 @@
       <div class="comment-config-container">
         <div class="comment-sort-container">
           <div class="comment-sort-title">Sort by: </div>
-          <Dropdown></Dropdown>
+          <Dropdown v-model="commentSort" :fetch-options="fetchCommentSorts" />
         </div>
       </div>
 
@@ -154,6 +154,7 @@ export default {
     const mainContainer = ref(null)
     const currentIndex = ref(1)
     const subscribed = ref(false)
+    const commentSort = ref('NEWEST')
 
     // record default metadata from the main document
     const defaultTitle = document.title
@@ -287,6 +288,7 @@ export default {
 
     const onCommentDeleted = (id) => {
       removeCommentFromList(Number(id), comments.value)
+      fetchComments()
     }
 
     const fetchPost = async () => {
@@ -310,13 +312,12 @@ export default {
         category.value = data.category
         tags.value = data.tags || []
         postReactions.value = data.reactions || []
-        comments.value = (data.comments || []).map(mapComment)
+        await fetchComments()
         subscribed.value = !!data.subscribed
         status.value = data.status
         pinnedAt.value = data.pinnedAt
         postTime.value = TimeManager.format(data.createdAt)
         await nextTick()
-        gatherPostItems()
       } catch (e) {
         console.error(e)
       }
@@ -379,9 +380,7 @@ export default {
         })
         if (res.ok) {
           const data = await res.json()
-          comments.value.push(mapComment(data))
-          await nextTick()
-          gatherPostItems()
+          await fetchComments()
           if (data.reward && data.reward > 0) {
             toast.success(`评论成功，获得 ${data.reward} 经验值`)
           } else {
@@ -524,6 +523,33 @@ export default {
       }
     }
 
+    const fetchCommentSorts = () => {
+      return Promise.resolve([
+        { id: 'NEWEST', name: '最新', icon: 'fas fa-clock' },
+        { id: 'OLDEST', name: '最旧', icon: 'fas fa-hourglass-start' },
+        { id: 'MOST_INTERACTIONS', name: '最多互动', icon: 'fas fa-fire' }
+      ])
+    }
+
+    const fetchComments = async () => {
+      try {
+        const token = getToken()
+        const res = await fetch(`${API_BASE_URL}/api/posts/${postId}/comments?sort=${commentSort.value}`, {
+          headers: { Authorization: token ? `Bearer ${token}` : '' }
+        })
+        if (res.ok) {
+          const data = await res.json()
+          comments.value = data.map(mapComment)
+          await nextTick()
+          gatherPostItems()
+        }
+      } catch {
+        // ignore
+      }
+    }
+
+    watch(commentSort, fetchComments)
+
     const jumpToHashComment = async () => {
       const hash = location.hash
       if (hash.startsWith('#comment-')) {
@@ -546,7 +572,6 @@ export default {
       const hash = location.hash
       const id = hash.startsWith('#comment-') ? hash.substring('#comment-'.length) : null
       await fetchPost()
-      gatherPostItems()
       if (id) expandCommentPath(id)
       updateCurrentIndex()
       await jumpToHashComment()
@@ -595,7 +620,9 @@ export default {
       lightboxImgs,
       handleContentClick,
       isMobile,
-      pinnedAt
+      pinnedAt,
+      commentSort,
+      fetchCommentSorts
     }
   }
 }
diff --git a/src/main/java/com/openisle/controller/CommentController.java b/src/main/java/com/openisle/controller/CommentController.java
index c3aab14d1..b6dccfdfd 100644
--- a/src/main/java/com/openisle/controller/CommentController.java
+++ b/src/main/java/com/openisle/controller/CommentController.java
@@ -4,6 +4,7 @@ import com.openisle.model.Comment;
 import com.openisle.service.CommentService;
 import com.openisle.service.CaptchaService;
 import com.openisle.service.LevelService;
+import com.openisle.model.CommentSort;
 import lombok.Data;
 import lombok.RequiredArgsConstructor;
 import org.springframework.http.ResponseEntity;
@@ -56,8 +57,9 @@ public class CommentController {
     }
 
     @GetMapping("/posts/{postId}/comments")
-    public List<CommentDto> listComments(@PathVariable Long postId) {
-        return commentService.getCommentsForPost(postId).stream()
+    public List<CommentDto> listComments(@PathVariable Long postId,
+                                         @RequestParam(value = "sort", required = false, defaultValue = "OLDEST") CommentSort sort) {
+        return commentService.getCommentsForPost(postId, sort).stream()
                 .map(this::toDtoWithReplies)
                 .collect(Collectors.toList());
     }
diff --git a/src/main/java/com/openisle/controller/PostController.java b/src/main/java/com/openisle/controller/PostController.java
index c839c2173..9b49ddc5c 100644
--- a/src/main/java/com/openisle/controller/PostController.java
+++ b/src/main/java/com/openisle/controller/PostController.java
@@ -4,6 +4,7 @@ import com.openisle.model.Comment;
 import com.openisle.model.Post;
 import com.openisle.model.Reaction;
 import com.openisle.service.CommentService;
+import com.openisle.model.CommentSort;
 import com.openisle.service.PostService;
 import com.openisle.service.ReactionService;
 import com.openisle.service.CaptchaService;
@@ -180,7 +181,7 @@ public class PostController {
                 .collect(Collectors.toList());
         dto.setReactions(reactions);
 
-        List<CommentDto> comments = commentService.getCommentsForPost(post.getId())
+        List<CommentDto> comments = commentService.getCommentsForPost(post.getId(), CommentSort.OLDEST)
                 .stream()
                 .map(this::toCommentDtoWithReplies)
                 .collect(Collectors.toList());
diff --git a/src/main/java/com/openisle/model/CommentSort.java b/src/main/java/com/openisle/model/CommentSort.java
new file mode 100644
index 000000000..515a5465e
--- /dev/null
+++ b/src/main/java/com/openisle/model/CommentSort.java
@@ -0,0 +1,10 @@
+package com.openisle.model;
+
+/**
+ * Sort options for comments.
+ */
+public enum CommentSort {
+    NEWEST,
+    OLDEST,
+    MOST_INTERACTIONS
+}
diff --git a/src/main/java/com/openisle/service/CommentService.java b/src/main/java/com/openisle/service/CommentService.java
index a2cca58ff..49d11c037 100644
--- a/src/main/java/com/openisle/service/CommentService.java
+++ b/src/main/java/com/openisle/service/CommentService.java
@@ -4,6 +4,7 @@ import com.openisle.model.Comment;
 import com.openisle.model.Post;
 import com.openisle.model.User;
 import com.openisle.model.NotificationType;
+import com.openisle.model.CommentSort;
 import com.openisle.repository.CommentRepository;
 import com.openisle.repository.PostRepository;
 import com.openisle.repository.UserRepository;
@@ -104,10 +105,16 @@ public class CommentService {
         return comment;
     }
 
-    public List<Comment> getCommentsForPost(Long postId) {
+    public List<Comment> getCommentsForPost(Long postId, CommentSort sort) {
         Post post = postRepository.findById(postId)
                 .orElseThrow(() -> new com.openisle.exception.NotFoundException("Post not found"));
-        return commentRepository.findByPostAndParentIsNullOrderByCreatedAtAsc(post);
+        List<Comment> list = commentRepository.findByPostAndParentIsNullOrderByCreatedAtAsc(post);
+        if (sort == CommentSort.NEWEST) {
+            list.sort(java.util.Comparator.comparing(Comment::getCreatedAt).reversed());
+        } else if (sort == CommentSort.MOST_INTERACTIONS) {
+            list.sort((a, b) -> Integer.compare(interactionCount(b), interactionCount(a)));
+        }
+        return list;
     }
 
     public List<Comment> getReplies(Long parentId) {
@@ -167,4 +174,10 @@ public class CommentService {
         imageUploader.removeReferences(imageUploader.extractUrls(comment.getContent()));
         commentRepository.delete(comment);
     }
+
+    private int interactionCount(Comment comment) {
+        int reactions = reactionRepository.findByComment(comment).size();
+        int replies = commentRepository.findByParentOrderByCreatedAtAsc(comment).size();
+        return reactions + replies;
+    }
 }
diff --git a/src/test/java/com/openisle/controller/CommentControllerTest.java b/src/test/java/com/openisle/controller/CommentControllerTest.java
index 959e8b90e..8eeabbef9 100644
--- a/src/test/java/com/openisle/controller/CommentControllerTest.java
+++ b/src/test/java/com/openisle/controller/CommentControllerTest.java
@@ -19,6 +19,7 @@ import java.time.LocalDateTime;
 import java.util.List;
 
 import static org.mockito.ArgumentMatchers.eq;
+import static org.mockito.ArgumentMatchers.any;
 import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
 import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.post;
 import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.jsonPath;
@@ -53,7 +54,7 @@ class CommentControllerTest {
     void createAndListComments() throws Exception {
         Comment comment = createComment(1L, "hi", "bob");
         Mockito.when(commentService.addComment(eq("bob"), eq(1L), eq("hi"))).thenReturn(comment);
-        Mockito.when(commentService.getCommentsForPost(1L)).thenReturn(List.of(comment));
+        Mockito.when(commentService.getCommentsForPost(eq(1L), any())).thenReturn(List.of(comment));
         Mockito.when(commentService.getReplies(1L)).thenReturn(List.of());
 
         mockMvc.perform(post("/api/posts/1/comments")
diff --git a/src/test/java/com/openisle/controller/PostControllerTest.java b/src/test/java/com/openisle/controller/PostControllerTest.java
index 6a46af268..7da8cdb25 100644
--- a/src/test/java/com/openisle/controller/PostControllerTest.java
+++ b/src/test/java/com/openisle/controller/PostControllerTest.java
@@ -184,7 +184,7 @@ class PostControllerTest {
         cr.setType(com.openisle.model.ReactionType.LIKE);
 
         Mockito.when(postService.viewPost(eq(1L), Mockito.isNull())).thenReturn(post);
-        Mockito.when(commentService.getCommentsForPost(1L)).thenReturn(List.of(comment));
+        Mockito.when(commentService.getCommentsForPost(eq(1L), any())).thenReturn(List.of(comment));
         Mockito.when(commentService.getReplies(2L)).thenReturn(List.of(reply));
         Mockito.when(commentService.getReplies(3L)).thenReturn(List.of());
         Mockito.when(commentService.getParticipants(Mockito.anyLong(), Mockito.anyInt())).thenReturn(java.util.List.of());