diff --git a/api/DTOs/PersonRequestDto.cs b/api/DTOs/PersonRequestDto.cs
new file mode 100644
index 0000000..e70c420
--- /dev/null
+++ b/api/DTOs/PersonRequestDto.cs
@@ -0,0 +1,8 @@
+namespace api.DTOs;
+
+public class PersonRequestDto
+{
+    public string Username { get; set; }
+    public string RealName { get; set; }
+    public DateOnly Birthday { get; set; }
+}
\ No newline at end of file
diff --git a/api/DTOs/PersonResponseDto.cs b/api/DTOs/PersonResponseDto.cs
new file mode 100644
index 0000000..074820c
--- /dev/null
+++ b/api/DTOs/PersonResponseDto.cs
@@ -0,0 +1,8 @@
+namespace api.DTOs;
+
+public class PersonResponseDto
+{
+    public string Username { get; set; }
+    public string RealName { get; set; }
+    public DateOnly Birthday { get; set; }
+}
\ No newline at end of file
diff --git a/api/Services/IPersonService.cs b/api/Services/IPersonService.cs
new file mode 100644
index 0000000..c7aa1e6
--- /dev/null
+++ b/api/Services/IPersonService.cs
@@ -0,0 +1,13 @@
+using api.DTOs;
+
+namespace api.Services
+{
+    public interface IPersonService
+    {
+        Task<IEnumerable<PersonResponseDto>> GetAllPersonsAsync();
+        Task<PersonResponseDto> GetPersonByIdAsync(int id);
+        Task AddPersonAsync(PersonRequestDto PersonDto);
+        Task UpdatePersonAsync(int id, PersonRequestDto PersonDto);
+        Task DeletePersonAsync(int id);
+    }
+}
\ No newline at end of file