diff --git a/internal/service/app.go b/internal/service/app.go
new file mode 100644
index 0000000..23b9c3b
--- /dev/null
+++ b/internal/service/app.go
@@ -0,0 +1,70 @@
+package service
+
+import (
+	"gotest/internal/repository"
+)
+
+// AppService 应用服务
+type AppService struct {
+	repo *repository.AppRepository
+}
+
+// NewAppService 创建应用服务实例
+func NewAppService(repo *repository.AppRepository) *AppService {
+	return &AppService{repo: repo}
+}
+
+// ListCategories 获取应用分类
+func (s *AppService) ListCategories() (interface{}, error) {
+	return s.repo.ListCategories()
+}
+
+// ListApps 获取应用列表
+func (s *AppService) ListApps(categoryID uint, keyword, sort string, page, pageSize int) (map[string]interface{}, error) {
+	apps, total, err := s.repo.ListApps(categoryID, keyword, sort, page, pageSize)
+	if err != nil {
+		return nil, err
+	}
+	return map[string]interface{}{
+		"list":      apps,
+		"total":     total,
+		"page":      page,
+		"page_size": pageSize,
+	}, nil
+}
+
+// GetApp 获取应用详情
+func (s *AppService) GetApp(id uint) (interface{}, error) {
+	return s.repo.GetApp(id)
+}
+
+// ListFeatured 获取精选应用
+func (s *AppService) ListFeatured(limit int) (interface{}, error) {
+	return s.repo.ListFeaturedApps(limit)
+}
+
+// ListNew 获取新上架应用
+func (s *AppService) ListNew(limit int) (interface{}, error) {
+	return s.repo.ListNewApps(limit)
+}
+
+// GetHomeData 获取应用首页数据（分类 + 精选 + 新上架）
+func (s *AppService) GetHomeData() (map[string]interface{}, error) {
+	categories, err := s.repo.ListCategories()
+	if err != nil {
+		return nil, err
+	}
+	featured, err := s.repo.ListFeaturedApps(8)
+	if err != nil {
+		return nil, err
+	}
+	newApps, err := s.repo.ListNewApps(4)
+	if err != nil {
+		return nil, err
+	}
+	return map[string]interface{}{
+		"categories": categories,
+		"featured":   featured,
+		"new":        newApps,
+	}, nil
+}