diff --git a/backend/IM_API/Configs/ServiceCollectionExtensions.cs b/backend/IM_API/Configs/ServiceCollectionExtensions.cs
new file mode 100644
index 0000000..b7ee2c6
--- /dev/null
+++ b/backend/IM_API/Configs/ServiceCollectionExtensions.cs
@@ -0,0 +1,10 @@
+namespace IM_API.Configs
+{
+    public static class ServiceCollectionExtensions
+    {
+        public static IServiceCollection AddAllService(this IServiceCollection services, IConfiguration configuration)
+        {
+            return services;
+        }
+     }
+}
diff --git a/backend/IM_API/Dtos/TestDto.cs b/backend/IM_API/Dtos/TestDto.cs
new file mode 100644
index 0000000..bd689d6
--- /dev/null
+++ b/backend/IM_API/Dtos/TestDto.cs
@@ -0,0 +1,8 @@
+namespace IM_API.Dtos
+{
+    public class TestDto
+    {
+        public int Id { get; set; }
+        public string Name { get; set; }
+    }
+}
diff --git a/backend/IM_API/Interface/Services/IDemo.cs b/backend/IM_API/Interface/Services/IDemo.cs
new file mode 100644
index 0000000..75bf461
--- /dev/null
+++ b/backend/IM_API/Interface/Services/IDemo.cs
@@ -0,0 +1,9 @@
+using IM_API.Dtos;
+
+namespace IM_API.Interface.Services
+{
+    public interface IDemo
+    {
+        TestDto Test();
+    }
+}
diff --git a/backend/IM_API/Models/IMDbContext.cs b/backend/IM_API/Models/IMDbContext.cs
index 39bc38f..5215258 100644
--- a/backend/IM_API/Models/IMDbContext.cs
+++ b/backend/IM_API/Models/IMDbContext.cs
@@ -50,10 +50,6 @@ public partial class IMDbContext : DbContext
 
     public virtual DbSet<User> Users { get; set; }
 
-    protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
-#warning To protect potentially sensitive information in your connection string, you should move it out of source code. You can avoid scaffolding the connection string by using the Name= syntax to read it from configuration - see https://go.microsoft.com/fwlink/?linkid=2131148. For more guidance on storing connection strings, see https://go.microsoft.com/fwlink/?LinkId=723263.
-        => optionsBuilder.UseMySql("server=192.168.5.100;port=3306;database=IM;user=root;password=768788Dyw", Microsoft.EntityFrameworkCore.ServerVersion.Parse("5.7.44-mysql"));
-
     protected override void OnModelCreating(ModelBuilder modelBuilder)
     {
         modelBuilder
diff --git a/backend/IM_API/Program.cs b/backend/IM_API/Program.cs
index 96341b4..e906aee 100644
--- a/backend/IM_API/Program.cs
+++ b/backend/IM_API/Program.cs
@@ -1,4 +1,8 @@
 
+using IM_API.Configs;
+using IM_API.Models;
+using Microsoft.EntityFrameworkCore;
+
 namespace IM_API
 {
     public class Program
@@ -8,7 +12,17 @@ namespace IM_API
             var builder = WebApplication.CreateBuilder(args);
 
             // Add services to the container.
+            IConfiguration configuration = new ConfigurationBuilder()
+            .SetBasePath(Directory.GetCurrentDirectory())
+            .AddJsonFile("appsettings.json", optional: false, reloadOnChange: true)
+            .Build();
+            string conStr = builder.Configuration.GetConnectionString("DefaultConnection")!;
 
+            builder.Services.AddDbContext<IMDbContext>(options =>
+            {
+                options.UseMySql(conStr,ServerVersion.AutoDetect(conStr));
+            });
+            builder.Services.AddAllService(configuration);
             builder.Services.AddControllers();
             // Learn more about configuring Swagger/OpenAPI at https://aka.ms/aspnetcore/swashbuckle
             builder.Services.AddEndpointsApiExplorer();
diff --git a/backend/IM_API/Services/Demo.cs b/backend/IM_API/Services/Demo.cs
new file mode 100644
index 0000000..4c12ef6
--- /dev/null
+++ b/backend/IM_API/Services/Demo.cs
@@ -0,0 +1,13 @@
+using IM_API.Dtos;
+using IM_API.Interface.Services;
+
+namespace IM_API.Services
+{
+    public class Demo : IDemo
+    {
+        public TestDto Test()
+        {
+            throw new NotImplementedException();
+        }
+    }
+}
diff --git a/backend/IM_API/appsettings.json b/backend/IM_API/appsettings.json
index 10f68b8..eb0a86a 100644
--- a/backend/IM_API/appsettings.json
+++ b/backend/IM_API/appsettings.json
@@ -5,5 +5,8 @@
       "Microsoft.AspNetCore": "Warning"
     }
   },
-  "AllowedHosts": "*"
+  "AllowedHosts": "*",
+  "ConnectionStrings": {
+    "DefaultConnection": "Server=192.168.5.100;Port=3306;Database=IM;User=root;Password=768788Dyw;"
+  }
 }
diff --git a/docs/后端代码规范文档.md b/docs/后端代码规范文档.md
new file mode 100644
index 0000000..6dbdf9a
--- /dev/null
+++ b/docs/后端代码规范文档.md
@@ -0,0 +1,69 @@
+# 项目规范文档
+
+## 1. 命名规范
+
+* **全局命名**
+
+  * 采用 **小驼峰命名法**（camelCase），例如：`aBbCc`。
+  * 特殊情况除外，例如 **.NET 编译器要求方法名使用大驼峰**（PascalCase）。
+
+* **各层命名规范**
+
+  * **Controllers**：自定义命名 + `Controller`
+  * **Services**：自定义命名 + `Service`
+  * **Dtos**：自定义命名 + `Dto`
+
+---
+
+## 2. 文件/文件夹规范
+
+| 文件夹                  | 功能描述                       | 注意事项                                         |
+| -------------------- | -------------------------- | -------------------------------------------- |
+| **Controllers**      | 存放控制器和 Actions，用于处理请求和响应   | 禁止直接操作数据库。如需数据库操作，应先在 Services 层编写业务逻辑再调用    |
+| **Services**         | 存放业务逻辑代码，包括数据库交互           | 应在 Service 层处理所有业务逻辑，保证 Controller 层纯粹用于请求处理 |
+| **Dtos**             | 存放不同层之间的数据传输模型（DTO）        | 用于数据类型转换，例如返回用户信息时需剔除密码等敏感信息。禁止直接返回数据库模型类    |
+| **Models**           | 存放数据库模型类（Entity）           | 一般情况下请勿随意修改                                  |
+| **appsettings.json** | 存放配置文件，如数据库连接字符串、Redis 配置等 | 禁止在业务代码中硬编码配置信息，统一放在此文件中                     |
+
+---
+
+## 3. Service 编写与使用规范
+
+### 3.1 编写 Service
+
+1. 在 `Interface/Services` 文件夹下创建接口，定义业务方法框架。
+2. 提交接口代码至 Gitea，合并并通过审核。
+3. 在 `Services` 文件夹下新建类，实现上述接口。
+
+### 3.2 注册 Service
+
+1. 在 `Configs/ServiceCollectionExtensions.cs` 文件的 `AddAllService` 方法中添加：
+
+```csharp
+services.AddTransient<接口类型, 实现类>();
+```
+
+2. 根据业务逻辑选择生命周期：
+
+   * **AddTransient**：瞬时
+   * **AddScoped**：请求范围
+   * **AddSingleton**：单例
+
+### 3.3 在 Controller 中使用 Service
+
+1. 在 Controller 内定义属性：
+
+```csharp
+private readonly IDemo _demo;
+```
+
+2. 在构造函数中通过依赖注入接收接口实例：
+
+```csharp
+public WeatherForecastController(IDemo demo)
+{
+    _demo = demo;
+}
+```
+
+3. 在 Controller 方法中使用 `_demo` 调用业务逻辑方法。