diff --git a/app/internal/logic/createpostlogic.go b/app/internal/logic/createpostlogic.go
index 9befe4d..787fc27 100644
--- a/app/internal/logic/createpostlogic.go
+++ b/app/internal/logic/createpostlogic.go
@@ -30,12 +30,12 @@ func (l *CreatePostLogic) CreatePost(req *types.CreatePostReq) (resp *types.Crea
 	var coverID sql.NullInt64
 
 	// If cover image key is provided, get the file ID from files table
-	if req.Cover_image_key != "" {
+	if req.CoverImageKey != "" {
 		query := `SELECT id FROM files WHERE file_key = $1`
-		err := l.svcCtx.DB.QueryRowContext(l.ctx, query, req.Cover_image_key).Scan(&coverID.Int64)
+		err := l.svcCtx.DB.QueryRowContext(l.ctx, query, req.CoverImageKey).Scan(&coverID.Int64)
 		if err != nil {
 			if err == sql.ErrNoRows {
-				l.Errorf("Cover image file not found with key: %s", req.Cover_image_key)
+				l.Errorf("Cover image file not found with key: %s", req.CoverImageKey)
 				return nil, fmt.Errorf("cover image not found")
 			}
 			l.Errorf("Failed to get cover image file: %v", err)
@@ -54,6 +54,6 @@ func (l *CreatePostLogic) CreatePost(req *types.CreatePostReq) (resp *types.Crea
 	}
 
 	return &types.CreatePostResp{
-		Post_id: fmt.Sprintf("%d", postID),
+		PostId: fmt.Sprintf("%d", postID),
 	}, nil
 }
diff --git a/app/internal/logic/deletepostlogic.go b/app/internal/logic/deletepostlogic.go
index 949aee7..2492900 100644
--- a/app/internal/logic/deletepostlogic.go
+++ b/app/internal/logic/deletepostlogic.go
@@ -28,7 +28,7 @@ func NewDeletePostLogic(ctx context.Context, svcCtx *svc.ServiceContext) *Delete
 func (l *DeletePostLogic) DeletePost(req *types.DeletePostReq) (resp *types.DeletePostResp, err error) {
 	// Delete post from database
 	query := `DELETE FROM posts WHERE id = $1`
-	result, err := l.svcCtx.DB.ExecContext(l.ctx, query, req.Post_id)
+	result, err := l.svcCtx.DB.ExecContext(l.ctx, query, req.PostId)
 	if err != nil {
 		l.Errorf("Failed to delete post: %v", err)
 		return nil, err
@@ -41,7 +41,7 @@ func (l *DeletePostLogic) DeletePost(req *types.DeletePostReq) (resp *types.Dele
 		return nil, err
 	}
 	if rowsAffected == 0 {
-		l.Errorf("Post not found with id: %s", req.Post_id)
+		l.Errorf("Post not found with id: %s", req.PostId)
 		return nil, fmt.Errorf("post not found")
 	}
 
diff --git a/app/internal/logic/downloadpresignedurllogic.go b/app/internal/logic/downloadpresignedurllogic.go
index 0bb17a9..634f8d7 100644
--- a/app/internal/logic/downloadpresignedurllogic.go
+++ b/app/internal/logic/downloadpresignedurllogic.go
@@ -37,7 +37,7 @@ func (l *DownloadPresignedURLLogic) DownloadPresignedURL(req *types.DownloadPres
 	// Generate presigned GET URL
 	getObjectInput := &s3.GetObjectInput{
 		Bucket: &l.svcCtx.Config.S3.Bucket,
-		Key:    &req.File_key,
+		Key:    &req.FileKey,
 	}
 
 	presignedReq, err := presignClient.PresignGetObject(l.ctx, getObjectInput, func(opts *s3.PresignOptions) {
@@ -49,7 +49,7 @@ func (l *DownloadPresignedURLLogic) DownloadPresignedURL(req *types.DownloadPres
 	}
 
 	return &types.DownloadPresignedURLResp{
-		Url:       presignedReq.URL,
-		Expire_at: expireAt,
+		Url:      presignedReq.URL,
+		ExpireAt: expireAt,
 	}, nil
 }
diff --git a/app/internal/logic/editpostlogic.go b/app/internal/logic/editpostlogic.go
index 70b11b2..641dd08 100644
--- a/app/internal/logic/editpostlogic.go
+++ b/app/internal/logic/editpostlogic.go
@@ -30,12 +30,12 @@ func (l *EditPostLogic) EditPost(req *types.EditPostReq) (resp *types.EditPostRe
 	var coverID sql.NullInt64
 
 	// If cover image key is provided, get the file ID from files table
-	if req.Cover_image_key != "" {
+	if req.CoverImageKey != "" {
 		query := `SELECT id FROM files WHERE file_key = $1`
-		err := l.svcCtx.DB.QueryRowContext(l.ctx, query, req.Cover_image_key).Scan(&coverID.Int64)
+		err := l.svcCtx.DB.QueryRowContext(l.ctx, query, req.CoverImageKey).Scan(&coverID.Int64)
 		if err != nil {
 			if err == sql.ErrNoRows {
-				l.Errorf("Cover image file not found with key: %s", req.Cover_image_key)
+				l.Errorf("Cover image file not found with key: %s", req.CoverImageKey)
 				return nil, fmt.Errorf("cover image not found")
 			}
 			l.Errorf("Failed to get cover image file: %v", err)
@@ -46,7 +46,7 @@ func (l *EditPostLogic) EditPost(req *types.EditPostReq) (resp *types.EditPostRe
 
 	// Update post with updated_at timestamp
 	query := `UPDATE posts SET title = $1, content = $2, cover_id = $3, updated_at = CURRENT_TIMESTAMP WHERE id = $4`
-	result, err := l.svcCtx.DB.ExecContext(l.ctx, query, req.Title, req.Content, coverID, req.Post_id)
+	result, err := l.svcCtx.DB.ExecContext(l.ctx, query, req.Title, req.Content, coverID, req.PostId)
 	if err != nil {
 		l.Errorf("Failed to update post: %v", err)
 		return nil, err
@@ -59,7 +59,7 @@ func (l *EditPostLogic) EditPost(req *types.EditPostReq) (resp *types.EditPostRe
 		return nil, err
 	}
 	if rowsAffected == 0 {
-		l.Errorf("Post not found with id: %s", req.Post_id)
+		l.Errorf("Post not found with id: %s", req.PostId)
 		return nil, fmt.Errorf("post not found")
 	}
 
diff --git a/app/internal/logic/getpostlogic.go b/app/internal/logic/getpostlogic.go
index 353b036..e0feadf 100644
--- a/app/internal/logic/getpostlogic.go
+++ b/app/internal/logic/getpostlogic.go
@@ -2,10 +2,14 @@ package logic
 
 import (
 	"context"
+	"database/sql"
+	"fmt"
+	"time"
 
 	"git.cialloo.com/CiallooWeb/Blog/app/internal/svc"
 	"git.cialloo.com/CiallooWeb/Blog/app/internal/types"
 
+	"github.com/aws/aws-sdk-go-v2/service/s3"
 	"github.com/zeromicro/go-zero/core/logx"
 )
 
@@ -25,7 +29,52 @@ func NewGetPostLogic(ctx context.Context, svcCtx *svc.ServiceContext) *GetPostLo
 }
 
 func (l *GetPostLogic) GetPost(req *types.GetPostReq) (resp *types.GetPostResp, err error) {
-	// todo: add your logic here and delete this line
+	var post types.GetPostResp
+	var coverID sql.NullInt64
 
-	return
+	// Query post with cover image
+	query := `
+		SELECT p.id, p.title, p.content, p.created_at, p.updated_at, p.cover_id
+		FROM posts p
+		WHERE p.id = $1
+	`
+	err = l.svcCtx.DB.QueryRowContext(l.ctx, query, req.PostId).Scan(
+		&post.PostId, &post.Title, &post.Content, &post.CreatedAt, &post.UpdatedAt, &coverID,
+	)
+	if err != nil {
+		if err == sql.ErrNoRows {
+			l.Errorf("Post not found with id: %s", req.PostId)
+			return nil, fmt.Errorf("post not found")
+		}
+		l.Errorf("Failed to get post: %v", err)
+		return nil, err
+	}
+
+	// If cover image exists, get its URL
+	if coverID.Valid {
+		coverQuery := `SELECT file_key FROM files WHERE id = $1`
+		var fileKey string
+		err = l.svcCtx.DB.QueryRowContext(l.ctx, coverQuery, coverID.Int64).Scan(&fileKey)
+		if err == nil {
+			// Generate presigned URL for cover image
+			expiration := time.Duration(l.svcCtx.Config.S3.PresignedURLExpiration) * time.Second
+			presignClient := s3.NewPresignClient(l.svcCtx.S3Client)
+			getObjectInput := &s3.GetObjectInput{
+				Bucket: &l.svcCtx.Config.S3.Bucket,
+				Key:    &fileKey,
+			}
+			presignedReq, err := presignClient.PresignGetObject(l.ctx, getObjectInput, func(opts *s3.PresignOptions) {
+				opts.Expires = expiration
+			})
+			if err == nil {
+				post.CoverImageUrl = presignedReq.URL
+			}
+		}
+	}
+
+	// Convert timestamps to Unix
+	post.CreatedAt = post.CreatedAt * 1000 // Convert to milliseconds if needed
+	post.UpdatedAt = post.UpdatedAt * 1000
+
+	return &post, nil
 }
diff --git a/app/internal/logic/listpostslogic.go b/app/internal/logic/listpostslogic.go
index 1c2ca68..7df17ad 100644
--- a/app/internal/logic/listpostslogic.go
+++ b/app/internal/logic/listpostslogic.go
@@ -2,10 +2,13 @@ package logic
 
 import (
 	"context"
+	"database/sql"
+	"time"
 
 	"git.cialloo.com/CiallooWeb/Blog/app/internal/svc"
 	"git.cialloo.com/CiallooWeb/Blog/app/internal/types"
 
+	"github.com/aws/aws-sdk-go-v2/service/s3"
 	"github.com/zeromicro/go-zero/core/logx"
 )
 
@@ -25,7 +28,82 @@ func NewListPostsLogic(ctx context.Context, svcCtx *svc.ServiceContext) *ListPos
 }
 
 func (l *ListPostsLogic) ListPosts(req *types.ListPostsReq) (resp *types.ListPostsResp, err error) {
-	// todo: add your logic here and delete this line
+	// Set default values
+	page := req.Page
+	if page < 1 {
+		page = 1
+	}
+	pageSize := req.PageSize
+	if pageSize < 1 || pageSize > 100 {
+		pageSize = 10 // Default page size
+	}
+	offset := (page - 1) * pageSize
 
-	return
+	// Get total count
+	var totalCount int
+	countQuery := `SELECT COUNT(*) FROM posts`
+	err = l.svcCtx.DB.QueryRowContext(l.ctx, countQuery).Scan(&totalCount)
+	if err != nil {
+		l.Errorf("Failed to get total count: %v", err)
+		return nil, err
+	}
+
+	// Get posts with pagination
+	postsQuery := `
+		SELECT p.id, p.title, p.created_at, p.updated_at, p.cover_id
+		FROM posts p
+		ORDER BY p.created_at DESC
+		LIMIT $1 OFFSET $2
+	`
+	rows, err := l.svcCtx.DB.QueryContext(l.ctx, postsQuery, pageSize, offset)
+	if err != nil {
+		l.Errorf("Failed to get posts: %v", err)
+		return nil, err
+	}
+	defer rows.Close()
+
+	var posts []types.ListPostsRespPosts
+	for rows.Next() {
+		var post types.ListPostsRespPosts
+		var coverID sql.NullInt64
+
+		err := rows.Scan(&post.PostId, &post.Title, &post.CreatedAt, &post.UpdatedAt, &coverID)
+		if err != nil {
+			l.Errorf("Failed to scan post: %v", err)
+			continue
+		}
+
+		// If cover image exists, get its URL
+		if coverID.Valid {
+			coverQuery := `SELECT file_key FROM files WHERE id = $1`
+			var fileKey string
+			err = l.svcCtx.DB.QueryRowContext(l.ctx, coverQuery, coverID.Int64).Scan(&fileKey)
+			if err == nil {
+				// Generate presigned URL for cover image
+				expiration := time.Duration(l.svcCtx.Config.S3.PresignedURLExpiration) * time.Second
+				presignClient := s3.NewPresignClient(l.svcCtx.S3Client)
+				getObjectInput := &s3.GetObjectInput{
+					Bucket: &l.svcCtx.Config.S3.Bucket,
+					Key:    &fileKey,
+				}
+				presignedReq, err := presignClient.PresignGetObject(l.ctx, getObjectInput, func(opts *s3.PresignOptions) {
+					opts.Expires = expiration
+				})
+				if err == nil {
+					post.CoverImageUrl = presignedReq.URL
+				}
+			}
+		}
+
+		// Convert timestamps to Unix milliseconds
+		post.CreatedAt = post.CreatedAt * 1000
+		post.UpdatedAt = post.UpdatedAt * 1000
+
+		posts = append(posts, post)
+	}
+
+	return &types.ListPostsResp{
+		Posts:      posts,
+		TotalCount: totalCount,
+	}, nil
 }
diff --git a/app/internal/logic/listtagslogic.go b/app/internal/logic/listtagslogic.go
index ec52ac6..b62d601 100644
--- a/app/internal/logic/listtagslogic.go
+++ b/app/internal/logic/listtagslogic.go
@@ -25,7 +25,27 @@ func NewListTagsLogic(ctx context.Context, svcCtx *svc.ServiceContext) *ListTags
 }
 
 func (l *ListTagsLogic) ListTags(req *types.ListTagsReq) (resp *types.ListTagsResp, err error) {
-	// todo: add your logic here and delete this line
+	// Query all hashtags
+	query := `SELECT id, name FROM hashtags ORDER BY name`
+	rows, err := l.svcCtx.DB.QueryContext(l.ctx, query)
+	if err != nil {
+		l.Errorf("Failed to get tags: %v", err)
+		return nil, err
+	}
+	defer rows.Close()
 
-	return
+	var tags []types.ListTagsRespTags
+	for rows.Next() {
+		var tag types.ListTagsRespTags
+		err := rows.Scan(&tag.TagId, &tag.TagName)
+		if err != nil {
+			l.Errorf("Failed to scan tag: %v", err)
+			continue
+		}
+		tags = append(tags, tag)
+	}
+
+	return &types.ListTagsResp{
+		Tags: tags,
+	}, nil
 }
diff --git a/app/internal/logic/pinglogic.go b/app/internal/logic/pinglogic.go
index 1b640cb..bf2acb9 100644
--- a/app/internal/logic/pinglogic.go
+++ b/app/internal/logic/pinglogic.go
@@ -26,6 +26,6 @@ func NewPingLogic(ctx context.Context, svcCtx *svc.ServiceContext) *PingLogic {
 
 func (l *PingLogic) Ping(req *types.PingReq) (resp *types.PingResp, err error) {
 	return &types.PingResp{
-		Ok: true,
+		OK: true,
 	}, nil
 }
diff --git a/app/internal/logic/uploadpresignedurllogic.go b/app/internal/logic/uploadpresignedurllogic.go
index 6a40ff0..d4a1dae 100644
--- a/app/internal/logic/uploadpresignedurllogic.go
+++ b/app/internal/logic/uploadpresignedurllogic.go
@@ -31,8 +31,8 @@ func NewUploadPresignedURLLogic(ctx context.Context, svcCtx *svc.ServiceContext)
 
 func (l *UploadPresignedURLLogic) UploadPresignedURL(req *types.UploadPresignedURLReq) (resp *types.UploadPresignedURLResp, err error) {
 	// Generate unique file key
-	ext := filepath.Ext(req.File_name)
-	fileKey := fmt.Sprintf("%s%s", uuid.New().String(), ext)
+	ext := filepath.Ext(req.FileName)
+	fileKey := fmt.Sprintf("uploads/%s%s", uuid.New().String(), ext)
 
 	// Calculate expiration time
 	expiration := time.Duration(l.svcCtx.Config.S3.PresignedURLExpiration) * time.Second
@@ -57,15 +57,15 @@ func (l *UploadPresignedURLLogic) UploadPresignedURL(req *types.UploadPresignedU
 
 	// Insert record into tmpfiles table
 	query := `INSERT INTO tmpfiles (file_name, key, presigned_url, expiration) VALUES ($1, $2, $3, $4)`
-	_, err = l.svcCtx.DB.ExecContext(l.ctx, query, req.File_name, fileKey, presignedReq.URL, expireAt)
+	_, err = l.svcCtx.DB.ExecContext(l.ctx, query, req.FileName, fileKey, presignedReq.URL, expireAt)
 	if err != nil {
 		l.Errorf("Failed to insert tmpfile record: %v", err)
 		return nil, err
 	}
 
 	return &types.UploadPresignedURLResp{
-		Url:       presignedReq.URL,
-		File_key:  fileKey,
-		Expire_at: expireAt.Unix(),
+		Url:      presignedReq.URL,
+		FileKey:  fileKey,
+		ExpireAt: expireAt.Unix(),
 	}, nil
 }