diff --git a/.idea/compiler.xml b/.idea/compiler.xml
index 67c191f..62ac42e 100644
--- a/.idea/compiler.xml
+++ b/.idea/compiler.xml
@@ -8,6 +8,7 @@
         <sourceTestOutputDir name="target/generated-test-sources/test-annotations" />
         <outputRelativeToContentRoot value="true" />
         <module name="spring-boot-server-template" />
+        <module name="spring-boot-apijson-server" />
       </profile>
     </annotationProcessing>
   </component>
diff --git a/src/main/java/com/lanyuanxiaoyao/server/configuration/Constants.java b/src/main/java/com/lanyuanxiaoyao/server/configuration/Constants.java
new file mode 100644
index 0000000..2c24ccc
--- /dev/null
+++ b/src/main/java/com/lanyuanxiaoyao/server/configuration/Constants.java
@@ -0,0 +1,9 @@
+package com.lanyuanxiaoyao.server.configuration;
+
+/**
+ * @author lanyuanxiaoyao
+ * @version 20250327
+ */
+public interface Constants {
+  String DATABASE_TABLE_PREFIX = "system_";
+}
diff --git a/src/main/java/com/lanyuanxiaoyao/server/configuration/database/SnowflakeIdGenerator.java b/src/main/java/com/lanyuanxiaoyao/server/configuration/database/SnowflakeId.java
similarity index 66%
rename from src/main/java/com/lanyuanxiaoyao/server/configuration/database/SnowflakeIdGenerator.java
rename to src/main/java/com/lanyuanxiaoyao/server/configuration/database/SnowflakeId.java
index f6bc1e5..54f93db 100644
--- a/src/main/java/com/lanyuanxiaoyao/server/configuration/database/SnowflakeIdGenerator.java
+++ b/src/main/java/com/lanyuanxiaoyao/server/configuration/database/SnowflakeId.java
@@ -1,11 +1,17 @@
 package com.lanyuanxiaoyao.server.configuration.database;
 
-import java.io.Serializable;
+import java.lang.annotation.Retention;
+import java.lang.annotation.Target;
 import java.time.Instant;
+import lombok.extern.slf4j.Slf4j;
+import org.hibernate.annotations.IdGeneratorType;
+import org.hibernate.annotations.ValueGenerationType;
 import org.hibernate.engine.spi.SharedSessionContractImplementor;
 import org.hibernate.id.IdentifierGenerator;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
+
+import static java.lang.annotation.ElementType.FIELD;
+import static java.lang.annotation.ElementType.METHOD;
+import static java.lang.annotation.RetentionPolicy.RUNTIME;
 
 /**
  * 使用雪花算法作为ID生成器
@@ -13,16 +19,24 @@ import org.slf4j.LoggerFactory;
  * @author lanyuanxiaoyao
  * @date 2024-11-14
  */
-public class SnowflakeIdGenerator implements IdentifierGenerator {
-  private static final Logger logger = LoggerFactory.getLogger(SnowflakeIdGenerator.class);
+@Slf4j
+public class SnowflakeId {
+  @IdGeneratorType(IdGenerator.class)
+  @ValueGenerationType(generatedBy = IdGenerator.class)
+  @Retention(RUNTIME)
+  @Target({FIELD, METHOD})
+  public @interface Generator {
+  }
 
-  @Override
-  public Serializable generate(SharedSessionContractImplementor session, Object object) {
-    try {
-      return Snowflake.next();
-    } catch (Exception e) {
-      logger.error("Generate snowflake id failed", e);
-      throw new RuntimeException(e);
+  public static final class IdGenerator implements IdentifierGenerator {
+    @Override
+    public Object generate(SharedSessionContractImplementor session, Object object) {
+      try {
+        return Snowflake.next();
+      } catch (Exception e) {
+        log.error("Generate snowflake id failed", e);
+        throw new RuntimeException(e);
+      }
     }
   }
 
diff --git a/src/main/java/com/lanyuanxiaoyao/server/entity/Department.java b/src/main/java/com/lanyuanxiaoyao/server/entity/Department.java
new file mode 100644
index 0000000..d8ccd9d
--- /dev/null
+++ b/src/main/java/com/lanyuanxiaoyao/server/entity/Department.java
@@ -0,0 +1,45 @@
+package com.lanyuanxiaoyao.server.entity;
+
+import com.lanyuanxiaoyao.server.configuration.Constants;
+import com.lanyuanxiaoyao.server.configuration.database.SnowflakeId;
+import jakarta.persistence.ConstraintMode;
+import jakarta.persistence.Entity;
+import jakarta.persistence.FetchType;
+import jakarta.persistence.ForeignKey;
+import jakarta.persistence.Id;
+import jakarta.persistence.JoinColumn;
+import jakarta.persistence.ManyToOne;
+import jakarta.persistence.OneToMany;
+import jakarta.persistence.Table;
+import java.util.Set;
+import lombok.Getter;
+import lombok.Setter;
+import lombok.ToString;
+
+/**
+ * 组织
+ *
+ * @author lanyuanxiaoyao
+ * @version 20250327
+ */
+@Getter
+@Setter
+@ToString
+@Entity
+@Table(name = Constants.DATABASE_TABLE_PREFIX + "department")
+public class Department {
+  @Id
+  @SnowflakeId.Generator
+  private Long departmentId;
+  private String departmentName;
+
+  @ManyToOne
+  @JoinColumn(nullable = false, foreignKey = @ForeignKey(ConstraintMode.NO_CONSTRAINT))
+  private Organization organization;
+
+  @ManyToOne
+  private Department parent;
+  @OneToMany(fetch = FetchType.LAZY, mappedBy = "departmentParent")
+  @ToString.Exclude
+  private Set<Department> children;
+}
diff --git a/src/main/java/com/lanyuanxiaoyao/server/entity/Organization.java b/src/main/java/com/lanyuanxiaoyao/server/entity/Organization.java
new file mode 100644
index 0000000..000d3e6
--- /dev/null
+++ b/src/main/java/com/lanyuanxiaoyao/server/entity/Organization.java
@@ -0,0 +1,35 @@
+package com.lanyuanxiaoyao.server.entity;
+
+import com.lanyuanxiaoyao.server.configuration.Constants;
+import com.lanyuanxiaoyao.server.configuration.database.SnowflakeId;
+import jakarta.persistence.Entity;
+import jakarta.persistence.FetchType;
+import jakarta.persistence.Id;
+import jakarta.persistence.OneToMany;
+import jakarta.persistence.Table;
+import java.util.Set;
+import lombok.Getter;
+import lombok.Setter;
+import lombok.ToString;
+
+/**
+ * 组织
+ *
+ * @author lanyuanxiaoyao
+ * @version 20250327
+ */
+@Getter
+@Setter
+@ToString
+@Entity
+@Table(name = Constants.DATABASE_TABLE_PREFIX + "organization")
+public class Organization {
+  @Id
+  @SnowflakeId.Generator
+  private Long organizationId;
+  private String organizationName;
+
+  @OneToMany(fetch = FetchType.LAZY, mappedBy = "organization")
+  @ToString.Exclude
+  private Set<Department> departments;
+}
diff --git a/src/main/java/com/lanyuanxiaoyao/server/entity/User.java b/src/main/java/com/lanyuanxiaoyao/server/entity/User.java
new file mode 100644
index 0000000..c77fa14
--- /dev/null
+++ b/src/main/java/com/lanyuanxiaoyao/server/entity/User.java
@@ -0,0 +1,30 @@
+package com.lanyuanxiaoyao.server.entity;
+
+import com.lanyuanxiaoyao.server.configuration.Constants;
+import com.lanyuanxiaoyao.server.configuration.database.SnowflakeId;
+import jakarta.persistence.Entity;
+import jakarta.persistence.Id;
+import jakarta.persistence.Table;
+import lombok.Getter;
+import lombok.Setter;
+import lombok.ToString;
+
+/**
+ * 用户
+ *
+ * @author lanyuanxiaoyao
+ * @version 20250327
+ */
+@Getter
+@Setter
+@ToString
+@Entity
+@Table(name = Constants.DATABASE_TABLE_PREFIX + "user")
+public class User {
+  @Id
+  @SnowflakeId.Generator
+  private Long userId;
+  private String userCode;
+  private String userNickName;
+  private String userSecret;
+}