diff --git a/backend/.gitignore b/backend/.gitignore
new file mode 100644
index 0000000..a35811d
--- /dev/null
+++ b/backend/.gitignore
@@ -0,0 +1,6 @@
+target/
+*.iml
+.idea/
+.vscode/
+.DS_Store
+*.log
diff --git a/backend/pom.xml b/backend/pom.xml
new file mode 100644
index 0000000..b529cc8
--- /dev/null
+++ b/backend/pom.xml
@@ -0,0 +1,165 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <parent>
+        <groupId>org.springframework.boot</groupId>
+        <artifactId>spring-boot-starter-parent</artifactId>
+        <version>3.3.5</version>
+        <relativePath/>
+    </parent>
+
+    <groupId>com.xly</groupId>
+    <artifactId>test4-backend</artifactId>
+    <version>0.0.1-SNAPSHOT</version>
+    <name>test4-backend</name>
+    <description>小羚羊 ERP 后端</description>
+
+    <properties>
+        <java.version>21</java.version>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+        <mybatis-plus.version>3.5.7</mybatis-plus.version>
+        <mapstruct.version>1.5.5.Final</mapstruct.version>
+        <lombok.version>1.18.32</lombok.version>
+        <lombok-mapstruct-binding.version>0.2.0</lombok-mapstruct-binding.version>
+        <jjwt.version>0.12.5</jjwt.version>
+        <springdoc.version>2.6.0</springdoc.version>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-web</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-security</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-validation</artifactId>
+        </dependency>
+
+        <dependency>
+            <groupId>com.baomidou</groupId>
+            <artifactId>mybatis-plus-spring-boot3-starter</artifactId>
+            <version>${mybatis-plus.version}</version>
+        </dependency>
+
+        <dependency>
+            <groupId>org.flywaydb</groupId>
+            <artifactId>flyway-core</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.flywaydb</groupId>
+            <artifactId>flyway-mysql</artifactId>
+        </dependency>
+
+        <dependency>
+            <groupId>com.mysql</groupId>
+            <artifactId>mysql-connector-j</artifactId>
+        </dependency>
+
+        <dependency>
+            <groupId>io.jsonwebtoken</groupId>
+            <artifactId>jjwt-api</artifactId>
+            <version>${jjwt.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>io.jsonwebtoken</groupId>
+            <artifactId>jjwt-impl</artifactId>
+            <version>${jjwt.version}</version>
+            <scope>runtime</scope>
+        </dependency>
+        <dependency>
+            <groupId>io.jsonwebtoken</groupId>
+            <artifactId>jjwt-jackson</artifactId>
+            <version>${jjwt.version}</version>
+            <scope>runtime</scope>
+        </dependency>
+
+        <dependency>
+            <groupId>org.mapstruct</groupId>
+            <artifactId>mapstruct</artifactId>
+            <version>${mapstruct.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.projectlombok</groupId>
+            <artifactId>lombok</artifactId>
+            <version>${lombok.version}</version>
+            <scope>provided</scope>
+        </dependency>
+
+        <dependency>
+            <groupId>org.springdoc</groupId>
+            <artifactId>springdoc-openapi-starter-webmvc-ui</artifactId>
+            <version>${springdoc.version}</version>
+        </dependency>
+
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-test</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.security</groupId>
+            <artifactId>spring-security-test</artifactId>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <finalName>test4-backend</finalName>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <configuration>
+                    <source>21</source>
+                    <target>21</target>
+                    <annotationProcessorPaths>
+                        <path>
+                            <groupId>org.projectlombok</groupId>
+                            <artifactId>lombok</artifactId>
+                            <version>${lombok.version}</version>
+                        </path>
+                        <path>
+                            <groupId>org.mapstruct</groupId>
+                            <artifactId>mapstruct-processor</artifactId>
+                            <version>${mapstruct.version}</version>
+                        </path>
+                        <path>
+                            <groupId>org.projectlombok</groupId>
+                            <artifactId>lombok-mapstruct-binding</artifactId>
+                            <version>${lombok-mapstruct-binding.version}</version>
+                        </path>
+                    </annotationProcessorPaths>
+                </configuration>
+            </plugin>
+            <plugin>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-maven-plugin</artifactId>
+                <configuration>
+                    <excludes>
+                        <exclude>
+                            <groupId>org.projectlombok</groupId>
+                            <artifactId>lombok</artifactId>
+                        </exclude>
+                    </excludes>
+                </configuration>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-surefire-plugin</artifactId>
+                <configuration>
+                    <includes>
+                        <include>**/*Test.java</include>
+                        <include>**/*IT.java</include>
+                    </includes>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+</project>
diff --git a/backend/src/main/java/com/xly/test4/Application.java b/backend/src/main/java/com/xly/test4/Application.java
new file mode 100644
index 0000000..8b91511
--- /dev/null
+++ b/backend/src/main/java/com/xly/test4/Application.java
@@ -0,0 +1,13 @@
+package com.xly.test4;
+
+import org.mybatis.spring.annotation.MapperScan;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+@MapperScan("com.xly.test4.module.*.mapper")
+public class Application {
+    public static void main(String[] args) {
+        SpringApplication.run(Application.class, args);
+    }
+}
diff --git a/backend/src/main/resources/application-dev.yml b/backend/src/main/resources/application-dev.yml
new file mode 100644
index 0000000..89503c4
--- /dev/null
+++ b/backend/src/main/resources/application-dev.yml
@@ -0,0 +1,4 @@
+logging:
+  level:
+    com.xly.test4: DEBUG
+    org.flywaydb: INFO
diff --git a/backend/src/main/resources/application.yml b/backend/src/main/resources/application.yml
new file mode 100644
index 0000000..91e40a0
--- /dev/null
+++ b/backend/src/main/resources/application.yml
@@ -0,0 +1,42 @@
+spring:
+  application:
+    name: test4-backend
+  profiles:
+    active: dev
+  config:
+    import: optional:file:../.env.local[.properties]
+  datasource:
+    url: jdbc:mysql://${DB_HOST}:${DB_PORT}/${DB_SCHEMA}?useUnicode=true&characterEncoding=utf8&serverTimezone=Asia/Shanghai&allowPublicKeyRetrieval=true&useSSL=false
+    username: ${DB_USER}
+    password: ${DB_PASSWORD}
+    driver-class-name: com.mysql.cj.jdbc.Driver
+  flyway:
+    enabled: true
+    locations: filesystem:../sql/migrations
+    baseline-on-migrate: false
+
+server:
+  port: 8080
+
+mybatis-plus:
+  mapper-locations: classpath:mapper/**/*.xml
+  global-config:
+    db-config:
+      id-type: AUTO
+  configuration:
+    map-underscore-to-camel-case: false
+
+app:
+  security:
+    default-password: "666666"
+    max-login-fail: 5
+    lock-minutes: 30
+    jwt:
+      secret: ${JWT_SECRET}
+      access-ttl-hours: 24
+
+springdoc:
+  api-docs:
+    path: /v3/api-docs
+  swagger-ui:
+    path: /swagger-ui.html
diff --git a/backend/src/test/java/com/xly/test4/ApplicationContextIT.java b/backend/src/test/java/com/xly/test4/ApplicationContextIT.java
new file mode 100644
index 0000000..513c284
--- /dev/null
+++ b/backend/src/test/java/com/xly/test4/ApplicationContextIT.java
@@ -0,0 +1,21 @@
+package com.xly.test4;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.context.ApplicationContext;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+@SpringBootTest
+class ApplicationContextIT {
+
+    @Autowired
+    private ApplicationContext context;
+
+    @Test
+    void contextLoads() {
+        assertThat(context).isNotNull();
+        assertThat(context.getBean(Application.class)).isNotNull();
+    }
+}