diff --git a/docs/docs/api/model/node-children.md b/docs/docs/api/model/node-children.md
index 4c1b76b61..2e8769411 100644
--- a/docs/docs/api/model/node-children.md
+++ b/docs/docs/api/model/node-children.md
@@ -13,111 +13,298 @@ sidebar_position: 2
 
 返回当前 children 实例所属的节点实例
 
+`@type {IPublicModelNode | null}`
+
+相关类型：[IPublicModelNode](https://github.com/alibaba/lowcode-engine/blob/main/packages/types/src/shell/model/node.ts)
+
 ### size
 
 children 内的节点实例数
 
-### isEmpty
+`@type {number}`
+
+
+### isEmptyNode
 
 是否为空
 
+`@type {boolean}`
+
+**@since v1.1.0**
+> v1.1.0 之前请使用 `isEmpty`
+
+### notEmptyNode
+
+是否不为空
+
+`@type {boolean}`
+
+**@since v1.1.0**
+
 ## 方法签名
 ### delete
-
-delete(node: Node)
-
 删除指定节点
 
+```typescript
+/**
+ * 删除指定节点
+ * delete the node
+ * @param node
+ */
+delete(node: IPublicModelNode): boolean;
+```
+
+相关类型：[IPublicModelNode](https://github.com/alibaba/lowcode-engine/blob/main/packages/types/src/shell/model/node.ts)
+
 ### insert
 
-insert(node: Node, at?: number | null)
-
 插入一个节点
 
+```typescript
+/**
+ * 删除指定节点
+ * delete the node
+ * @param node
+ */
+delete(node: IPublicModelNode): boolean;
+```
+
+相关类型：[IPublicModelNode](https://github.com/alibaba/lowcode-engine/blob/main/packages/types/src/shell/model/node.ts)
+
+
 ### indexOf
 
-indexOf(node: Node)
-
 返回指定节点的下标
 
+```typescript
+/**
+ * 返回指定节点的下标
+ * get index of node in current children
+ * @param node
+ * @returns
+ */
+indexOf(node: IPublicModelNode): number;
+```
+
+相关类型：[IPublicModelNode](https://github.com/alibaba/lowcode-engine/blob/main/packages/types/src/shell/model/node.ts)
+
 ### splice
 
-splice(start: number, deleteCount: number, node?: Node)
-
 类似数组 splice 操作
 
+```typescript
+/**
+ * 类似数组 splice 操作
+ * provide the same function with {Array.prototype.splice}
+ * @param start
+ * @param deleteCount
+ * @param node
+ */
+splice(start: number, deleteCount: number, node?: IPublicModelNode): any;
+```
+
+相关类型：[IPublicModelNode](https://github.com/alibaba/lowcode-engine/blob/main/packages/types/src/shell/model/node.ts)
+
+
 ### get
 
-get(index: number)
-
 返回指定下标的节点
 
+```typescript
+/**
+ * 返回指定下标的节点
+ * get node with index
+ * @param index
+ * @returns
+ */
+get(index: number): IPublicModelNode | null;
+```
+
+相关类型：[IPublicModelNode](https://github.com/alibaba/lowcode-engine/blob/main/packages/types/src/shell/model/node.ts)
+
+
 ### has
 
-has(node: Node)
-
 是否包含指定节点
 
+```typescript
+/**
+ * 是否包含指定节点
+ * check if node exists in current children
+ * @param node
+ * @returns
+ */
+has(node: IPublicModelNode): boolean;
+```
+
+相关类型：[IPublicModelNode](https://github.com/alibaba/lowcode-engine/blob/main/packages/types/src/shell/model/node.ts)
+
+
 ### forEach
 
-forEach(fn: (node: Node, index: number) => void)
-
 类似数组的 forEach
 
+```typescript
+/**
+ * 类似数组的 forEach
+ * provide the same function with {Array.prototype.forEach}
+ * @param fn
+ */
+forEach(fn: (node: IPublicModelNode, index: number) => void): void;
+
+```
+
+相关类型：[IPublicModelNode](https://github.com/alibaba/lowcode-engine/blob/main/packages/types/src/shell/model/node.ts)
+
+
 ### map
 
-map<T\>(fn: (node: Node, index: number) => T[])
-
 类似数组的 map
 
+```typescript
+/**
+ * 类似数组的 map
+ * provide the same function with {Array.prototype.map}
+ * @param fn
+ */
+map<T>(fn: (node: IPublicModelNode, index: number) => T[]): any[] | null;
+```
+
+相关类型：[IPublicModelNode](https://github.com/alibaba/lowcode-engine/blob/main/packages/types/src/shell/model/node.ts)
+
+
 ### every
 
-every(fn: (node: Node, index: number) => boolean)
-
 类似数组的 every
 
+```typescript
+/**
+ * 类似数组的 every
+ * provide the same function with {Array.prototype.every}
+ * @param fn
+ */
+every(fn: (node: IPublicModelNode, index: number) => boolean): boolean;
+```
+
+相关类型：[IPublicModelNode](https://github.com/alibaba/lowcode-engine/blob/main/packages/types/src/shell/model/node.ts)
+
+
 ### some
 
-some(fn: (node: Node, index: number) => boolean)
-
 类似数组的 some
 
+```typescript
+/**
+ * 类似数组的 some
+ * provide the same function with {Array.prototype.some}
+ * @param fn
+ */
+some(fn: (node: IPublicModelNode, index: number) => boolean): boolean;
+```
+
+相关类型：[IPublicModelNode](https://github.com/alibaba/lowcode-engine/blob/main/packages/types/src/shell/model/node.ts)
+
+
 ### filter
 
-filter(fn: (node: Node, index: number) => boolean)
-
 类似数组的 filter
 
+```typescript
+/**
+ * 类似数组的 filter
+ * provide the same function with {Array.prototype.filter}
+ * @param fn
+ */
+filter(fn: (node: IPublicModelNode, index: number) => boolean): any;
+```
+
+相关类型：[IPublicModelNode](https://github.com/alibaba/lowcode-engine/blob/main/packages/types/src/shell/model/node.ts)
+
+
 ### find
 
-find(fn: (node: Node, index: number) => boolean)
-
 类似数组的 find
 
+```typescript
+/**
+ * 类似数组的 find
+ * provide the same function with {Array.prototype.find}
+ * @param fn
+ */
+find(fn: (node: IPublicModelNode, index: number) => boolean): IPublicModelNode | null;
+```
+
+相关类型：[IPublicModelNode](https://github.com/alibaba/lowcode-engine/blob/main/packages/types/src/shell/model/node.ts)
+
+
 ### reduce
 
-reduce(fn: (acc: any, cur: Node) => any, initialValue: any)
-
 类似数组的 reduce
 
+```typescript
+/**
+ * 类似数组的 reduce
+ * provide the same function with {Array.prototype.reduce}
+ * @param fn
+ */
+reduce(fn: (acc: any, cur: IPublicModelNode) => any, initialValue: any): void;
+```
+
+相关类型：[IPublicModelNode](https://github.com/alibaba/lowcode-engine/blob/main/packages/types/src/shell/model/node.ts)
+
+
 ### importSchema
 
-importSchema(data?: NodeData | NodeData[])
-
 导入 schema
 
+```typescript
+/**
+ * 导入 schema
+ * import schema
+ * @param data
+ */
+importSchema(data?: IPublicTypeNodeData | IPublicTypeNodeData[]): void;
+```
+
+相关类型：[IPublicTypeNodeData](https://github.com/alibaba/lowcode-engine/blob/main/packages/types/src/shell/type/node-data.ts)
+
+
 ### exportSchema
-
-exportSchema(stage: IPulicEnumTransformStage = IPulicEnumTransformStage.Render)
-
 导出 schema
 
+```typescript
+/**
+ * 导出 schema
+ * export schema
+ * @param stage
+ */
+exportSchema(stage: IPublicEnumTransformStage): IPublicTypeNodeSchema;
+```
+
+相关类型：
+- [IPublicEnumTransformStage](https://github.com/alibaba/lowcode-engine/blob/main/packages/types/src/shell/enum/transform-stage.ts)
+- [IPublicTypeNodeSchema](https://github.com/alibaba/lowcode-engine/blob/main/packages/types/src/shell/type/node-schema.ts)
+
+
 ### mergeChildren
 
-mergeChildren(
-    remover: (node: Node, idx: number) => boolean,
-    adder: (children: Node[]) => any,
-    sorter: (firstNode: Node, secondNode: Node) => number,
-  )
+执行新增、删除、排序等操作
 
-执行新增、删除、排序等操作
\ No newline at end of file
+```typescript
+/**
+ * 执行新增、删除、排序等操作
+ * excute remove/add/sort operations
+ * @param remover
+ * @param adder
+ * @param sorter
+ */
+mergeChildren(
+  remover: (node: IPublicModelNode, idx: number) => boolean,
+  adder: (children: IPublicModelNode[]) => IPublicTypeNodeData[] | null,
+  sorter: (firstNode: IPublicModelNode, secondNode: IPublicModelNode) => number
+): any;
+```
+
+相关类型：
+- [IPublicModelNode](https://github.com/alibaba/lowcode-engine/blob/main/packages/types/src/shell/model/node.ts)
+- [IPublicTypeNodeData](https://github.com/alibaba/lowcode-engine/blob/main/packages/types/src/shell/type/node-data.ts)
diff --git a/packages/designer/src/document/node/node-children.ts b/packages/designer/src/document/node/node-children.ts
index 3604ce4be..9993f4c04 100644
--- a/packages/designer/src/document/node/node-children.ts
+++ b/packages/designer/src/document/node/node-children.ts
@@ -10,18 +10,68 @@ export interface IOnChangeOptions {
   node: Node;
 }
 
-export interface INodeChildren extends IPublicModelNodeChildren {
+export interface INodeChildren extends Omit<IPublicModelNodeChildren, 'forEach' | 'map' | 'every' | 'some' | 'filter' | 'find' | 'reduce' | 'mergeChildren' > {
+  unlinkChild(node: INode): void;
+  /**
+   * 删除一个节点
+   */
+  internalDelete(
+      node: INode,
+      purge: boolean,
+      useMutator: boolean,
+      options: NodeRemoveOptions
+    ): boolean;
 
+  /**
+   * 插入一个节点，返回新长度
+   */
+  internalInsert(node: INode, at?: number | null, useMutator?: boolean): void;
+
+  import(data?: IPublicTypeNodeData | IPublicTypeNodeData[], checkId?: boolean): void;
+
+  /**
+   * 导出 schema
+   */
+  export(stage: IPublicEnumTransformStage): IPublicTypeNodeData[];
+
+  /** following methods are overriding super interface, using different param types */
+  /** overriding methods start */
+
+  forEach(fn: (item: INode, index: number) => void): void;
+
+  map<T>(fn: (item: INode, index: number) => T): T[] | null;
+
+  every(fn: (item: INode, index: number) => any): boolean;
+
+  some(fn: (item: INode, index: number) => any): boolean;
+
+  filter(fn: (item: INode, index: number) => any): any;
+
+  find(fn: (item: INode, index: number) => boolean): any;
+
+  reduce(fn: (acc: any, cur: INode) => any, initialValue: any): void;
+
+  mergeChildren(
+    remover: (node: INode, idx: number) => boolean,
+    adder: (children: INode[]) => IPublicTypeNodeData[] | null,
+    sorter: (firstNode: INode, secondNode: INode) => number,
+  ): any;
+
+  /** overriding methods end */
 }
 export class NodeChildren implements INodeChildren {
   @obx.shallow private children: INode[];
 
   private emitter: IEventBus = createModuleEventBus('NodeChildren');
 
-  constructor(readonly owner: INode, data: IPublicTypeNodeData | IPublicTypeNodeData[], options: any = {}) {
+  constructor(
+      readonly owner: INode,
+      data: IPublicTypeNodeData | IPublicTypeNodeData[],
+      options: any = {},
+    ) {
     makeObservable(this);
     this.children = (Array.isArray(data) ? data : [data]).map((child) => {
-      return this.owner.document.createNode(child, options.checkId);
+      return this.owner.document?.createNode(child, options.checkId);
     });
   }
 
@@ -36,7 +86,7 @@ export class NodeChildren implements INodeChildren {
     stage = compatStage(stage);
     return this.children.map((node) => {
       const data = node.export(stage);
-      if (node.isLeaf() && IPublicEnumTransformStage.Save === stage) {
+      if (node.isLeafNode && IPublicEnumTransformStage.Save === stage) {
         // FIXME: filter empty
         return data.children as IPublicTypeNodeData;
       }
@@ -88,13 +138,21 @@ export class NodeChildren implements INodeChildren {
   }
 
   /**
-   * 是否空
+   *
    */
   isEmpty() {
+    return this.isEmptyNode;
+  }
+
+  get isEmptyNode(): boolean {
     return this.size < 1;
   }
 
   notEmpty() {
+    return this.notEmptyNode;
+  }
+
+  get notEmptyNode(): boolean {
     return this.size > 0;
   }
 
@@ -132,9 +190,16 @@ export class NodeChildren implements INodeChildren {
   /**
    * 删除一个节点
    */
-  delete(node: INode, purge = false, useMutator = true, options: NodeRemoveOptions = {}): boolean {
+  delete(node: INode): boolean {
+    return this.internalDelete(node);
+  }
+
+  /**
+   * 删除一个节点
+   */
+  internalDelete(node: INode, purge = false, useMutator = true, options: NodeRemoveOptions = {}): boolean {
     node.internalPurgeStart();
-    if (node.isParental()) {
+    if (node.isParentalNode) {
       foreachReverse(
         node.children,
         (subNode: Node) => {
@@ -168,9 +233,9 @@ export class NodeChildren implements INodeChildren {
       const editor = workspace.isActive ? workspace.window.editor : globalContext.get('editor');
       editor.eventBus.emit('node.remove', { node, index: i });
     }
-    document.unlinkNode(node);
-    document.selection.remove(node.id);
-    document.destroyNode(node);
+    document?.unlinkNode(node);
+    document?.selection.remove(node.id);
+    document?.destroyNode(node);
     this.emitter.emit('change', {
       type: 'delete',
       node,
@@ -191,10 +256,14 @@ export class NodeChildren implements INodeChildren {
     return false;
   }
 
+  insert(node: INode, at?: number | null): void {
+    this.internalInsert(node, at, true);
+  }
+
   /**
    * 插入一个节点，返回新长度
    */
-  insert(node: INode, at?: number | null, useMutator = true): void {
+  internalInsert(node: INode, at?: number | null, useMutator = true): void {
     const { children } = this;
     let index = at == null || at === -1 ? children.length : at;
 
@@ -349,7 +418,7 @@ export class NodeChildren implements INodeChildren {
     return this.children.some((child, index) => fn(child, index));
   }
 
-  filter(fn: (item: INode, index: number) => any) {
+  filter(fn: (item: INode, index: number) => any): any {
     return this.children.filter(fn);
   }
 
@@ -384,7 +453,7 @@ export class NodeChildren implements INodeChildren {
       const items = adder(this.children);
       if (items && items.length > 0) {
         items.forEach((child: IPublicTypeNodeData) => {
-          const node = this.owner.document.createNode(child);
+          const node = this.owner.document?.createNode(child);
           this.children.push(node);
           node.internalSetParent(this.owner);
         });
@@ -423,10 +492,10 @@ export class NodeChildren implements INodeChildren {
     if (!node) {
       return;
     }
-    if (node.isRoot()) {
+    if (node.isRootNode) {
       return;
     }
-    const callbacks = owner.componentMeta.getMetadata().configure.advanced?.callbacks;
+    const callbacks = owner.componentMeta?.getMetadata().configure.advanced?.callbacks;
     if (callbacks?.onSubtreeModified) {
       try {
         callbacks?.onSubtreeModified.call(
@@ -439,7 +508,7 @@ export class NodeChildren implements INodeChildren {
       }
     }
 
-    if (owner.parent && !owner.parent.isRoot()) {
+    if (owner.parent && !owner.parent.isRootNode) {
       this.reportModified(node, owner.parent, { ...options, propagated: true });
     }
   }
diff --git a/packages/designer/src/document/node/node.ts b/packages/designer/src/document/node/node.ts
index 169dc5cbf..67eb817bf 100644
--- a/packages/designer/src/document/node/node.ts
+++ b/packages/designer/src/document/node/node.ts
@@ -22,7 +22,7 @@ import { compatStage, isDOMText, isJSExpression } from '@alilc/lowcode-utils';
 import { SettingTopEntry } from '@alilc/lowcode-designer';
 import { Props, getConvertedExtraKey } from './props/props';
 import { DocumentModel } from '../document-model';
-import { NodeChildren } from './node-children';
+import { NodeChildren, INodeChildren } from './node-children';
 import { Prop } from './props/prop';
 import { ComponentMeta } from '../../component-meta';
 import { ExclusiveGroup, isExclusiveGroup } from './exclusive-group';
@@ -36,6 +36,22 @@ export interface INode extends IPublicModelNode {
   setVisible(flag: boolean): void;
 
   getVisible(): boolean;
+
+  /**
+   * 内部方法，请勿使用
+   * @param useMutator 是否触发联动逻辑
+   */
+  internalSetParent(parent: INode | null, useMutator: boolean): void;
+
+  setConditionGroup(grp: IPublicModelExclusiveGroup | string | null): void;
+
+  internalToShellNode(): IPublicModelNode | null;
+
+  internalPurgeStart(): void;
+
+  unlinkSlot(slotNode: Node): void;
+
+  didDropOut(dragment: Node): void;
 }
 
 /**
@@ -116,7 +132,7 @@ export class Node<Schema extends IPublicTypeNodeSchema = IPublicTypeNodeSchema>
    */
   props: Props;
 
-  protected _children?: NodeChildren;
+  protected _children?: INodeChildren;
 
   /**
    * @deprecated
@@ -135,7 +151,7 @@ export class Node<Schema extends IPublicTypeNodeSchema = IPublicTypeNodeSchema>
   /**
    * 当前节点子集
    */
-  get children(): NodeChildren | null {
+  get children(): INodeChildren | null {
     return this._children || null;
   }
 
@@ -390,7 +406,7 @@ export class Node<Schema extends IPublicTypeNodeSchema = IPublicTypeNodeSchema>
       if (this.isSlot()) {
         this._parent.unlinkSlot(this);
       } else {
-        this._parent.children.unlinkChild(this);
+        this._parent.children?.unlinkChild(this);
       }
     }
     if (useMutator) {
@@ -449,9 +465,9 @@ export class Node<Schema extends IPublicTypeNodeSchema = IPublicTypeNodeSchema>
       }
       if (this.isSlot()) {
         this.parent.removeSlot(this, purge);
-        this.parent.children.delete(this, purge, useMutator, { suppressRemoveEvent: true });
+        this.parent.children.internalDelete(this, purge, useMutator, { suppressRemoveEvent: true });
       } else {
-        this.parent.children.delete(this, purge, useMutator, { suppressRemoveEvent: true });
+        this.parent.children.internalDelete(this, purge, useMutator, { suppressRemoveEvent: true });
       }
     }
   }
@@ -965,12 +981,12 @@ export class Node<Schema extends IPublicTypeNodeSchema = IPublicTypeNodeSchema>
 
   insertBefore(node: Node, ref?: Node, useMutator = true) {
     const nodeInstance = ensureNode(node, this.document);
-    this.children?.insert(nodeInstance, ref ? ref.index : null, useMutator);
+    this.children?.internalInsert(nodeInstance, ref ? ref.index : null, useMutator);
   }
 
   insertAfter(node: any, ref?: Node, useMutator = true) {
     const nodeInstance = ensureNode(node, this.document);
-    this.children?.insert(nodeInstance, ref ? ref.index + 1 : null, useMutator);
+    this.children?.internalInsert(nodeInstance, ref ? ref.index + 1 : null, useMutator);
   }
 
   getParent() {
@@ -1337,7 +1353,7 @@ export function insertChild(
     node = container.document.createNode(thing);
   }
 
-  container.children.insert(node, at);
+  container.children.internalInsert(node, at);
 
   return node;
 }
diff --git a/packages/designer/tests/designer/designer.test.ts b/packages/designer/tests/designer/designer.test.ts
index 4a00017e8..8bca7d84a 100644
--- a/packages/designer/tests/designer/designer.test.ts
+++ b/packages/designer/tests/designer/designer.test.ts
@@ -103,6 +103,7 @@ describe('Designer 测试', () => {
               return x;
             },
             insert() {},
+            internalInsert() {},
           },
         };
         const mockDetail = { type: 'Children', index: 1, near: { node: { x: 1 } } };
@@ -172,6 +173,7 @@ describe('Designer 测试', () => {
               return x;
             },
             insert() {},
+            internalInsert() {},
           },
         };
         const mockDetail = { type: 'Children', index: 1, near: { node: { x: 1 } } };
@@ -407,6 +409,7 @@ describe('Designer 测试', () => {
           return x;
         },
         insert() {},
+        internalInsert() {},
       },
     };
     const mockDetail = { type: 'Children', index: 1, near: { node: { x: 1 } } };
@@ -431,6 +434,7 @@ describe('Designer 测试', () => {
             return x;
           },
           insert() {},
+          internalInsert() {},
         },
       },
       detail: mockDetail,
diff --git a/packages/shell/src/model/node-children.ts b/packages/shell/src/model/node-children.ts
index 702cfa82f..9f8792ee3 100644
--- a/packages/shell/src/model/node-children.ts
+++ b/packages/shell/src/model/node-children.ts
@@ -1,16 +1,16 @@
-import { Node as InnerNode } from '@alilc/lowcode-designer';
-import { IPublicTypeNodeSchema, IPublicTypeNodeData, IPublicEnumTransformStage, IPublicModelNodeChildren, IPublicModelNode } from '@alilc/lowcode-types';
+import { INode as InnerNode, INodeChildren } from '@alilc/lowcode-designer';
+import { IPublicTypeNodeData, IPublicEnumTransformStage, IPublicModelNodeChildren, IPublicModelNode } from '@alilc/lowcode-types';
 import { Node } from './node';
 import { nodeSymbol, nodeChildrenSymbol } from '../symbols';
 
 export class NodeChildren implements IPublicModelNodeChildren {
-  private readonly [nodeChildrenSymbol]: IPublicModelNodeChildren;
+  private readonly [nodeChildrenSymbol]: INodeChildren;
 
-  constructor(nodeChildren: IPublicModelNodeChildren) {
+  constructor(nodeChildren: INodeChildren) {
     this[nodeChildrenSymbol] = nodeChildren;
   }
 
-  static create(nodeChildren: IPublicModelNodeChildren | null): IPublicModelNodeChildren | null {
+  static create(nodeChildren: INodeChildren | null): IPublicModelNodeChildren | null {
     if (!nodeChildren) {
       return null;
     }
@@ -37,7 +37,7 @@ export class NodeChildren implements IPublicModelNodeChildren {
    * @returns
    */
   get isEmpty(): boolean {
-    return this[nodeChildrenSymbol].isEmpty();
+    return this[nodeChildrenSymbol].isEmptyNode;
   }
 
   /**
@@ -45,7 +45,7 @@ export class NodeChildren implements IPublicModelNodeChildren {
    * @returns
    */
   get isEmptyNode(): boolean {
-    return this[nodeChildrenSymbol].isEmpty();
+    return this[nodeChildrenSymbol].isEmptyNode;
   }
 
   /**
@@ -53,23 +53,23 @@ export class NodeChildren implements IPublicModelNodeChildren {
    * judge if it is not empty
    */
   get notEmpty(): boolean {
-    return this[nodeChildrenSymbol].notEmpty();
+    return this[nodeChildrenSymbol].notEmptyNode;
   }
 
   /**
    * judge if it is not empty
    */
   get notEmptyNode(): boolean {
-    return this[nodeChildrenSymbol].notEmpty();
+    return this[nodeChildrenSymbol].notEmptyNode;
   }
 
   /**
    * 删除指定节点
+   * delete the node
    * @param node
-   * @returns
    */
   delete(node: IPublicModelNode): boolean {
-    return this[nodeChildrenSymbol].delete((node as any));
+    return this[nodeChildrenSymbol].delete((node as any)?.[nodeSymbol]);
   }
 
   /**
@@ -79,7 +79,7 @@ export class NodeChildren implements IPublicModelNodeChildren {
    * @returns
    */
   insert(node: IPublicModelNode, at?: number | null): void {
-    return this[nodeChildrenSymbol].insert((node as any), at, true);
+    return this[nodeChildrenSymbol].insert((node as any)?.[nodeSymbol], at);
   }
 
   /**
@@ -88,7 +88,7 @@ export class NodeChildren implements IPublicModelNodeChildren {
    * @returns
    */
   indexOf(node: IPublicModelNode): number {
-    return this[nodeChildrenSymbol].indexOf((node as any));
+    return this[nodeChildrenSymbol].indexOf((node as any)?.[nodeSymbol]);
   }
 
   /**
@@ -106,7 +106,7 @@ export class NodeChildren implements IPublicModelNodeChildren {
    * @param index
    * @returns
    */
-  get(index: number): any {
+  get(index: number): IPublicModelNode | null {
     return Node.create(this[nodeChildrenSymbol].get(index));
   }
 
@@ -116,7 +116,7 @@ export class NodeChildren implements IPublicModelNodeChildren {
    * @returns
    */
   has(node: IPublicModelNode): boolean {
-    return this[nodeChildrenSymbol].has((node as any));
+    return this[nodeChildrenSymbol].has((node as any)?.[nodeSymbol]);
   }
 
   /**
@@ -124,7 +124,7 @@ export class NodeChildren implements IPublicModelNodeChildren {
    * @param fn
    */
   forEach(fn: (node: IPublicModelNode, index: number) => void): void {
-    this[nodeChildrenSymbol].forEach((item: InnerNode<IPublicTypeNodeSchema>, index: number) => {
+    this[nodeChildrenSymbol].forEach((item: InnerNode, index: number) => {
       fn(Node.create(item)!, index);
     });
   }
@@ -134,7 +134,7 @@ export class NodeChildren implements IPublicModelNodeChildren {
    * @param fn
    */
   map<T>(fn: (node: IPublicModelNode, index: number) => T[]): any[] | null {
-    return this[nodeChildrenSymbol].map((item: InnerNode<IPublicTypeNodeSchema>, index: number) => {
+    return this[nodeChildrenSymbol].map((item: InnerNode, index: number) => {
       return fn(Node.create(item)!, index);
     });
   }
@@ -144,7 +144,7 @@ export class NodeChildren implements IPublicModelNodeChildren {
    * @param fn
    */
   every(fn: (node: IPublicModelNode, index: number) => boolean): boolean {
-    return this[nodeChildrenSymbol].every((item: InnerNode<IPublicTypeNodeSchema>, index: number) => {
+    return this[nodeChildrenSymbol].every((item: InnerNode, index: number) => {
       return fn(Node.create(item)!, index);
     });
   }
@@ -154,7 +154,7 @@ export class NodeChildren implements IPublicModelNodeChildren {
    * @param fn
    */
   some(fn: (node: IPublicModelNode, index: number) => boolean): boolean {
-    return this[nodeChildrenSymbol].some((item: InnerNode<IPublicTypeNodeSchema>, index: number) => {
+    return this[nodeChildrenSymbol].some((item: InnerNode, index: number) => {
       return fn(Node.create(item)!, index);
     });
   }
@@ -165,10 +165,10 @@ export class NodeChildren implements IPublicModelNodeChildren {
    */
   filter(fn: (node: IPublicModelNode, index: number) => boolean): any {
     return this[nodeChildrenSymbol]
-      .filter((item: InnerNode<IPublicTypeNodeSchema>, index: number) => {
+      .filter((item: InnerNode, index: number) => {
         return fn(Node.create(item)!, index);
       })
-      .map((item: InnerNode<IPublicTypeNodeSchema>) => Node.create(item)!);
+      .map((item: InnerNode) => Node.create(item)!);
   }
 
   /**
@@ -177,7 +177,7 @@ export class NodeChildren implements IPublicModelNodeChildren {
    */
   find(fn: (node: IPublicModelNode, index: number) => boolean): IPublicModelNode | null {
     return Node.create(
-      this[nodeChildrenSymbol].find((item: InnerNode<IPublicTypeNodeSchema>, index: number) => {
+      this[nodeChildrenSymbol].find((item: InnerNode, index: number) => {
         return fn(Node.create(item)!, index);
       }),
     );
@@ -219,8 +219,9 @@ export class NodeChildren implements IPublicModelNodeChildren {
   mergeChildren(
     remover: (node: IPublicModelNode, idx: number) => boolean,
     adder: (children: IPublicModelNode[]) => any,
-    sorter: (firstNode: IPublicModelNode, secondNode: IPublicModelNode) => number,
+    originalSorter: (firstNode: IPublicModelNode, secondNode: IPublicModelNode) => number,
   ) {
+    let sorter = originalSorter;
     if (!sorter) {
       sorter = () => 0;
     }
diff --git a/packages/types/src/shell/model/node-children.ts b/packages/types/src/shell/model/node-children.ts
index e0df7d24c..c6fde9403 100644
--- a/packages/types/src/shell/model/node-children.ts
+++ b/packages/types/src/shell/model/node-children.ts
@@ -5,11 +5,13 @@ import { IPublicModelNode } from './';
 export interface IPublicModelNodeChildren {
   /**
    * 返回当前 children 实例所属的节点实例
+   * get owner node of this nodeChildren
    */
   get owner(): IPublicModelNode | null;
 
   /**
    * children 内的节点实例数
+   * get count of child nodes
    */
   get size(): number;
 
@@ -39,13 +41,14 @@ export interface IPublicModelNodeChildren {
 
   /**
    * 删除指定节点
+   * delete the node
    * @param node
-   * @returns
    */
   delete(node: IPublicModelNode): boolean;
 
   /**
    * 插入一个节点
+   * insert a node at specific position
    * @param node 待插入节点
    * @param at 插入下标
    * @returns
@@ -54,6 +57,7 @@ export interface IPublicModelNodeChildren {
 
   /**
    * 返回指定节点的下标
+   * get index of node in current children
    * @param node
    * @returns
    */
@@ -61,6 +65,7 @@ export interface IPublicModelNodeChildren {
 
   /**
    * 类似数组 splice 操作
+   * provide the same function with {Array.prototype.splice}
    * @param start
    * @param deleteCount
    * @param node
@@ -69,13 +74,15 @@ export interface IPublicModelNodeChildren {
 
   /**
    * 返回指定下标的节点
+   * get node with index
    * @param index
    * @returns
    */
-  get(index: number): any;
+  get(index: number): IPublicModelNode | null;
 
   /**
    * 是否包含指定节点
+   * check if node exists in current children
    * @param node
    * @returns
    */
@@ -83,55 +90,74 @@ export interface IPublicModelNodeChildren {
 
   /**
    * 类似数组的 forEach
+   * provide the same function with {Array.prototype.forEach}
    * @param fn
    */
   forEach(fn: (node: IPublicModelNode, index: number) => void): void;
 
   /**
    * 类似数组的 map
+   * provide the same function with {Array.prototype.map}
    * @param fn
    */
   map<T>(fn: (node: IPublicModelNode, index: number) => T[]): any[] | null;
 
   /**
    * 类似数组的 every
+   * provide the same function with {Array.prototype.every}
    * @param fn
    */
   every(fn: (node: IPublicModelNode, index: number) => boolean): boolean;
 
   /**
    * 类似数组的 some
+   * provide the same function with {Array.prototype.some}
    * @param fn
    */
   some(fn: (node: IPublicModelNode, index: number) => boolean): boolean;
 
   /**
    * 类似数组的 filter
+   * provide the same function with {Array.prototype.filter}
    * @param fn
    */
   filter(fn: (node: IPublicModelNode, index: number) => boolean): any;
 
   /**
    * 类似数组的 find
+   * provide the same function with {Array.prototype.find}
    * @param fn
    */
   find(fn: (node: IPublicModelNode, index: number) => boolean): IPublicModelNode | null;
 
+  /**
+   * 类似数组的 reduce
+   * provide the same function with {Array.prototype.reduce}
+   * @param fn
+   */
   reduce(fn: (acc: any, cur: IPublicModelNode) => any, initialValue: any): void;
 
   /**
    * 导入 schema
+   * import schema
    * @param data
    */
   importSchema(data?: IPublicTypeNodeData | IPublicTypeNodeData[]): void;
 
   /**
    * 导出 schema
+   * export schema
    * @param stage
-   * @returns
    */
   exportSchema(stage: IPublicEnumTransformStage): IPublicTypeNodeSchema;
 
+  /**
+   * 执行新增、删除、排序等操作
+   * excute remove/add/sort operations
+   * @param remover
+   * @param adder
+   * @param sorter
+   */
   mergeChildren(
     remover: (node: IPublicModelNode, idx: number) => boolean,
     adder: (children: IPublicModelNode[]) => IPublicTypeNodeData[] | null,