diff --git a/dev.md b/dev.md
index 62f19e0..c124f90 100644
--- a/dev.md
+++ b/dev.md
@@ -122,7 +122,7 @@
 
 数据端目前正在从旧引擎进行彻底性重构，分为三层：
 
-**Layer 0 — 公共层**：包含公共接口、工具函数等内容，不依赖任何外部游戏逻辑，可被任意高层直接引用。内容较少，与 Layer 1 共同放在 `@user/data-base` 中，不单独开包。
+**Layer 0 — 公共层**：包含公共接口、工具函数等内容，不依赖任何外部游戏逻辑，可被任意高层直接引用。包含统一接口 `IDataCommon`。
 
 **Layer 1 — 数据层**：包含所有会影响游戏存档与流程的数据内容，如地图、怪物、玩家属性等。本层通过统一接口 `IStateBase` 对外暴露数据访问能力，各类数据模块均以此接口为核心组织。
 
diff --git a/packages-user/data-base/src/types.ts b/packages-user/data-base/src/types.ts
index 94e65e0..796a4b6 100644
--- a/packages-user/data-base/src/types.ts
+++ b/packages-user/data-base/src/types.ts
@@ -34,3 +34,8 @@ export interface IStateBase<TEnemy, THero> extends IDataCommon {
      */
     getSaveableContent<T>(id: string): ISaveableContent<T> | null;
 }
+
+export interface IStateBaseExtended<TEnemy = unknown, THero = unknown> {
+    /** 当前对象对应的数据层对象（Layer 1 对象） */
+    readonly state: IStateBase<TEnemy, THero>;
+}
diff --git a/packages-user/data-common/src/types.ts b/packages-user/data-common/src/types.ts
index d814269..dffe3f9 100644
--- a/packages-user/data-common/src/types.ts
+++ b/packages-user/data-common/src/types.ts
@@ -11,6 +11,6 @@ export interface IDataCommon {
 }
 
 export interface IDataCommonExtended {
-    /** 当前对象对应的基本数据端对象（Layer 0 对象） */
+    /** 当前对象对应的公共层对象（Layer 0 对象） */
     readonly state: IDataCommon;
 }
diff --git a/packages-user/data-state/src/types.ts b/packages-user/data-state/src/types.ts
index beb114d..73de768 100644
--- a/packages-user/data-state/src/types.ts
+++ b/packages-user/data-state/src/types.ts
@@ -3,7 +3,7 @@ import { IEnemyAttr } from './enemy';
 import { IHeroAttr } from './hero';
 import { ILoadProgressTotal } from '@motajs/loader';
 import { ISaveSystem } from './save';
-import { IEnemyContext } from '@user/data-system';
+import { IStateSystem } from '@user/data-system';
 import { ISaveableContent } from '@user/data-common';
 
 export interface ISaveableExecutor<T, TEnemy = IEnemyAttr, THero = IHeroAttr> {
@@ -15,14 +15,11 @@ export interface ISaveableExecutor<T, TEnemy = IEnemyAttr, THero = IHeroAttr> {
     afterLoad(data: T, state: IStateBase<TEnemy, THero>): void;
 }
 
-export interface ICoreState extends IStateBase<IEnemyAttr, IHeroAttr> {
+export interface ICoreState extends IStateSystem<IEnemyAttr, IHeroAttr> {
     /** 加载进度对象 */
     readonly loadProgress: ILoadProgressTotal;
     /** 数据端加载对象 */
     readonly dataLoader: IMotaDataLoader;
-    /** 怪物上下文 */
-    readonly enemyContext: IEnemyContext<IEnemyAttr, IHeroAttr>;
-
     /** 存档系统 */
     readonly saveSystem: ISaveSystem;
 
diff --git a/packages-user/data-system/src/index.ts b/packages-user/data-system/src/index.ts
index 25a6dfe..d7cdcfd 100644
--- a/packages-user/data-system/src/index.ts
+++ b/packages-user/data-system/src/index.ts
@@ -1,2 +1,4 @@
 export * from './combat';
 export * from './trigger';
+
+export * from './types';
diff --git a/packages-user/data-system/src/types.ts b/packages-user/data-system/src/types.ts
new file mode 100644
index 0000000..f08ee0b
--- /dev/null
+++ b/packages-user/data-system/src/types.ts
@@ -0,0 +1,12 @@
+import { IStateBase } from '@user/data-base';
+import { IEnemyContext } from './combat';
+
+export interface IStateSystem<TEnemy, THero> extends IStateBase<TEnemy, THero> {
+    /** 怪物上下文 */
+    readonly enemyContext: IEnemyContext<TEnemy, THero>;
+}
+
+export interface IStateSystemExtended<TEnemy = unknown, THero = unknown> {
+    /** 当前对象对应的执行层对象（Layer 2 对象） */
+    readonly state: IStateSystem<TEnemy, THero>;
+}