diff --git a/src/main/java/com/pt/controller/CommentController.java b/src/main/java/com/pt/controller/CommentController.java
new file mode 100644
index 0000000..a85d131
--- /dev/null
+++ b/src/main/java/com/pt/controller/CommentController.java
@@ -0,0 +1,78 @@
+package com.pt.controller;
+
+import com.pt.constant.Constants;
+import com.pt.service.CommentService;
+import com.pt.utils.JWTUtils;
+import com.pt.entity.Comment;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.*;
+
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+@RestController
+@RequestMapping("/api/comment")
+@CrossOrigin(origins = "*")
+public class CommentController {
+
+    @Autowired
+    private CommentService commentService;
+
+    @PostMapping("/add")
+    public ResponseEntity<?> addComment(
+            @RequestHeader("token") String token,
+            @RequestParam("content") String content,
+            @RequestParam("username") String username,
+            @RequestParam("postId") int postId
+    ) {
+        Map<String, Object> ans = new HashMap<>();
+
+        if (!JWTUtils.checkToken(token, username, Constants.UserRole.USER)) {
+            ans.put("result", "Invalid token");
+            return ResponseEntity.badRequest().body(ans);
+        }
+
+        commentService.addComment(content, username, postId);
+        ans.put("result", "Comment added successfully");
+        return ResponseEntity.ok(ans);
+    }
+
+    @DeleteMapping("/delete")
+    public ResponseEntity<?> deleteComment(
+            @RequestHeader("token") String token,
+            @RequestParam("commentId") int commentId,
+            @RequestParam("username") String username
+    ) {
+        Map<String, Object> ans = new HashMap<>();
+
+        if (!JWTUtils.checkToken(token, username, Constants.UserRole.ADMIN)) {
+            ans.put("result", "Invalid token");
+            return ResponseEntity.badRequest().body(ans);
+        }
+
+        commentService.deleteComment(commentId);
+        ans.put("result", "Comment deleted successfully");
+        return ResponseEntity.ok(ans);
+    }
+
+    @GetMapping("/get")
+    public ResponseEntity<?> getComments(
+            @RequestHeader("token") String token,
+            @RequestParam("postId") int postId,
+            @RequestParam("username") String username
+    ) {
+        Map<String, Object> ans = new HashMap<>();
+
+        if(!JWTUtils.checkToken(token, username, Constants.UserRole.USER)) {
+            ans.put("result", "Invalid token");
+            return ResponseEntity.badRequest().body(ans);
+        }
+
+        List<Comment> comments = commentService.getCommentsByPostId(postId);
+        ans.put("result", "Comments retrieved successfully");
+        ans.put("comments", comments);
+        return ResponseEntity.ok(ans);
+    }
+}
diff --git a/src/main/java/com/pt/controller/PostController.java b/src/main/java/com/pt/controller/PostController.java
index 844dc65..387cc2d 100644
--- a/src/main/java/com/pt/controller/PostController.java
+++ b/src/main/java/com/pt/controller/PostController.java
@@ -61,7 +61,6 @@
         * @param title 帖子标题（可选）
         * @param author 帖子作者（可选）
         * @param date 帖子发布日期（可选）
-        * @return 帖子列表的响应
      */
     @GetMapping("/list")
     public ResponseEntity<?> getPost(
diff --git a/src/main/java/com/pt/entity/Comment.java b/src/main/java/com/pt/entity/Comment.java
new file mode 100644
index 0000000..b40100b
--- /dev/null
+++ b/src/main/java/com/pt/entity/Comment.java
@@ -0,0 +1,75 @@
+package com.pt.entity;
+
+import jakarta.persistence.Entity;
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.GenerationType;
+import jakarta.persistence.Id;
+
+import java.time.LocalDateTime;
+
+@Entity
+public class Comment {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private int commentId;
+
+    private String content;
+    private String writer;
+    private int parentPost;
+
+    private LocalDateTime publishDate;
+
+    public Comment() {
+        publishDate = LocalDateTime.now();
+    }
+
+    public Comment(String content, String writer, int parentPost) {
+        this.content = content;
+        this.writer = writer;
+        this.parentPost = parentPost;
+        this.publishDate = LocalDateTime.now();
+    }
+
+    public int getCommentId() {
+        return commentId;
+    }
+
+    public void setCommentId(int commentId) {
+        this.commentId = commentId;
+    }
+
+    public String getContent() {
+        return content;
+    }
+
+    public void setContent(String content) {
+        this.content = content;
+    }
+
+    public String getWriter() {
+        return writer;
+    }
+
+    public void setWriter(String writer) {
+        this.writer = writer;
+    }
+
+    public int getParentPost() {
+        return parentPost;
+    }
+
+    public void setParentPost(int parentPost) {
+        this.parentPost = parentPost;
+    }
+
+    public LocalDateTime getPublishDate() {
+        return publishDate;
+    }
+
+    public void setPublishDate(LocalDateTime publishDate) {
+        this.publishDate = publishDate;
+    }
+}
+
+
diff --git a/src/main/java/com/pt/repository/CommentRepository.java b/src/main/java/com/pt/repository/CommentRepository.java
new file mode 100644
index 0000000..3f5f88e
--- /dev/null
+++ b/src/main/java/com/pt/repository/CommentRepository.java
@@ -0,0 +1,24 @@
+package com.pt.repository;
+
+import com.pt.entity.Comment;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.data.jpa.repository.Query;
+import org.springframework.data.repository.query.Param;
+
+import java.time.LocalDate;
+import java.time.LocalDateTime;
+import java.util.List;
+
+public interface CommentRepository extends JpaRepository<Comment, Integer> {
+    Comment findByContent(String content);
+
+    Comment findByWriter(String writer);
+
+    @Query(value = "SELECT c FROM Comment c WHERE c.writer = :writer")
+    List<Comment> listByWriter(@Param("writer") String writer);
+
+    @Query(value = "SELECT c FROM Comment c WHERE c.publishDate = :date")
+    List<Comment> listByDate(@Param("date") LocalDateTime date);
+
+    List<Comment> findByParentPost(int parentPost);
+}
diff --git a/src/main/java/com/pt/service/CommentService.java b/src/main/java/com/pt/service/CommentService.java
new file mode 100644
index 0000000..3d8b7dd
--- /dev/null
+++ b/src/main/java/com/pt/service/CommentService.java
@@ -0,0 +1,40 @@
+package com.pt.service;
+
+import com.pt.entity.Comment;
+import com.pt.repository.CommentRepository;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+
+import java.util.List;
+
+@Service
+public class CommentService {
+
+    @Autowired
+    private CommentRepository commentRepository;
+
+    public CommentService(CommentRepository commentRepository) {
+        this.commentRepository = commentRepository;
+    }
+
+    public void addComment(String content, String username, int postId) {
+        Comment comment = new Comment();
+        comment.setContent(content);
+        comment.setWriter(username);
+        comment.setParentPost(postId);
+        commentRepository.save(comment);
+    }
+
+    public void deleteComment(int commentId) {
+        commentRepository.deleteById(commentId);
+    }
+
+    public List<Comment> getCommentsByPostId(int postId) {
+        List<Comment> comments = commentRepository.findByParentPost(postId);
+        comments.sort(
+                // Sort comments by publish date in descending order
+                (c1, c2) -> c2.getPublishDate().compareTo(c1.getPublishDate())
+        );
+        return comments;
+    }
+}