diff --git a/XisongSpaceBooking_BackEnd/Program.cs b/XisongSpaceBooking_BackEnd/Program.cs
index b2d3eca..f252fec 100644
--- a/XisongSpaceBooking_BackEnd/Program.cs
+++ b/XisongSpaceBooking_BackEnd/Program.cs
@@ -2,6 +2,7 @@ using Microsoft.EntityFrameworkCore;
 using Microsoft.OpenApi.Models;
 using XisongSpaceBooking_BackEnd.Configurations;
 using XisongSpaceBooking_BackEnd.Repositories;
+using XisongSpaceBooking_BackEnd.Services;
 
 var builder = WebApplication.CreateBuilder(args);
 
@@ -17,6 +18,10 @@ builder.Services.AddAutoMapper(cfg =>
 builder.Services.AddScoped<IRoleRepository, RoleRepository>();
 builder.Services.AddScoped<IDepartmentRepository, DepartmentRepository>();
 
+// 註冊 Service 服務
+builder.Services.AddScoped<IRoleService, RoleService>();
+builder.Services.AddScoped<IDepartmentService, DepartmentService>();
+
 // 配置 Entity Framework 與連線池
 builder.Services.AddDbContextPool<SpaceBookingDbContext>(options =>
 {
diff --git a/XisongSpaceBooking_BackEnd/Services/DepartmentService.cs b/XisongSpaceBooking_BackEnd/Services/DepartmentService.cs
new file mode 100644
index 0000000..0babda4
--- /dev/null
+++ b/XisongSpaceBooking_BackEnd/Services/DepartmentService.cs
@@ -0,0 +1,36 @@
+嚜簑sing AutoMapper;
+using XisongSpaceBooking_BackEnd.Models.DTOs;
+using XisongSpaceBooking_BackEnd.Repositories;
+
+namespace XisongSpaceBooking_BackEnd.Services
+{
+    /// <summary>
+    /// ���摰斗平������頛臬祕雿�
+    /// </summary>
+    public class DepartmentService : IDepartmentService
+    {
+        private readonly IDepartmentRepository _departmentRepository;
+        private readonly IMapper _mapper;
+
+        /// <summary>
+        /// 撱箸����賢��
+        /// </summary>
+        /// <param name="departmentRepository">���摰方�����摮����</param>
+        /// <param name="mapper">��拐辣���撠����</param>
+        public DepartmentService(IDepartmentRepository departmentRepository, IMapper mapper)
+        {
+            _departmentRepository = departmentRepository ?? throw new ArgumentNullException(nameof(departmentRepository));
+            _mapper = mapper ?? throw new ArgumentNullException(nameof(mapper));
+        }
+
+        /// <summary>
+        /// ���敺����������摰方�����
+        /// </summary>
+        /// <returns>���������摰� DTO ���������</returns>
+        public async Task<IEnumerable<DepartmentDto>> GetAllAsync()
+        {
+            var departments = await _departmentRepository.GetAllAsync();
+            return _mapper.Map<IEnumerable<DepartmentDto>>(departments);
+        }
+    }
+}
diff --git a/XisongSpaceBooking_BackEnd/Services/IDepartmentService.cs b/XisongSpaceBooking_BackEnd/Services/IDepartmentService.cs
new file mode 100644
index 0000000..023ee9a
--- /dev/null
+++ b/XisongSpaceBooking_BackEnd/Services/IDepartmentService.cs
@@ -0,0 +1,16 @@
+嚜簑sing XisongSpaceBooking_BackEnd.Models.DTOs;
+
+namespace XisongSpaceBooking_BackEnd.Services
+{
+    /// <summary>
+    /// ���摰斗平������頛臭�����
+    /// </summary>
+    public interface IDepartmentService
+    {
+        /// <summary>
+        /// ���敺����������摰方�����
+        /// </summary>
+        /// <returns>���������摰� DTO ���������</returns>
+        Task<IEnumerable<DepartmentDto>> GetAllAsync();
+    }
+}
\ No newline at end of file
diff --git a/XisongSpaceBooking_BackEnd/Services/IRoleService.cs b/XisongSpaceBooking_BackEnd/Services/IRoleService.cs
new file mode 100644
index 0000000..fa07eee
--- /dev/null
+++ b/XisongSpaceBooking_BackEnd/Services/IRoleService.cs
@@ -0,0 +1,16 @@
+嚜簑sing XisongSpaceBooking_BackEnd.Models.DTOs;
+
+namespace XisongSpaceBooking_BackEnd.Services
+{
+    /// <summary>
+    /// 頨思遢璆剖�����頛臭�����
+    /// </summary>
+    public interface IRoleService
+    {
+        /// <summary>
+        /// ���敺�������頨思遢鞈����
+        /// </summary>
+        /// <returns>������頨思遢 DTO ���������</returns>
+        Task<IEnumerable<RoleDto>> GetAllAsync();
+    }
+}
\ No newline at end of file
diff --git a/XisongSpaceBooking_BackEnd/Services/RoleService.cs b/XisongSpaceBooking_BackEnd/Services/RoleService.cs
new file mode 100644
index 0000000..cb2a626
--- /dev/null
+++ b/XisongSpaceBooking_BackEnd/Services/RoleService.cs
@@ -0,0 +1,36 @@
+嚜簑sing AutoMapper;
+using XisongSpaceBooking_BackEnd.Models.DTOs;
+using XisongSpaceBooking_BackEnd.Repositories;
+
+namespace XisongSpaceBooking_BackEnd.Services
+{
+    /// <summary>
+    /// 頨思遢璆剖�����頛臬祕雿�
+    /// </summary>
+    public class RoleService : IRoleService
+    {
+        private readonly IRoleRepository _roleRepository;
+        private readonly IMapper _mapper;
+
+        /// <summary>
+        /// 撱箸����賢��
+        /// </summary>
+        /// <param name="roleRepository">頨思遢鞈����摮����</param>
+        /// <param name="mapper">��拐辣���撠����</param>
+        public RoleService(IRoleRepository roleRepository, IMapper mapper)
+        {
+            _roleRepository = roleRepository ?? throw new ArgumentNullException(nameof(roleRepository));
+            _mapper = mapper ?? throw new ArgumentNullException(nameof(mapper));
+        }
+
+        /// <summary>
+        /// ���敺�������頨思遢鞈����
+        /// </summary>
+        /// <returns>������頨思遢 DTO ���������</returns>
+        public async Task<IEnumerable<RoleDto>> GetAllAsync()
+        {
+            var roles = await _roleRepository.GetAllAsync();
+            return _mapper.Map<IEnumerable<RoleDto>>(roles);
+        }
+    }
+}