diff --git a/__test__/EntityData.quo.ts b/__test__/EntityData.quo.ts
index b16ed251e..0df47d094 100644
--- a/__test__/EntityData.quo.ts
+++ b/__test__/EntityData.quo.ts
@@ -1,4 +1,3 @@
-import * as console from 'console';
 import { autorun } from 'mobx';
 import * as mst from 'mobx-state-tree';
 
diff --git a/__test__/FileSystem/FileSystem.test.ts b/__test__/FileSystem/FileSystem.test.ts
index 9d43c4672..653ce9ac2 100644
--- a/__test__/FileSystem/FileSystem.test.ts
+++ b/__test__/FileSystem/FileSystem.test.ts
@@ -1,6 +1,5 @@
 
-import * as THREE from 'three';
-
+import { ArrayRemove } from '../../src/Common/Utils';
 /*
 关于webCAD 文件系统的原型.
 包括了对象的保存,撤销,还原.
@@ -156,6 +155,10 @@ class CADObject
     {
         return this.isErase;
     }
+    Erase(isErase: boolean = true)
+    {
+        this.isErase = isErase;
+    }
     //#endregion
 
     //#region -------------------------id-------------------------
@@ -212,6 +215,108 @@ class CADFile
 {
 }
 
+
+class AppendData extends CADObject
+{
+    objData: CADFile;
+    //#region -----------------------------File-----------------------------
+    //对象应该实现dataIn和DataOut的方法,为了对象的序列化和反序列化
+    //类名,保证序列化时得到正确的new
+    get ClassName(): string
+    {
+        return "CADObject";
+    }
+    //对象从文件中读取数据,初始化自身
+    FileIn(file: CADFile)
+    { }
+    //对象将自身数据写入到文件.
+    FileOut(file: CADFile)
+    { }
+    //局部撤销
+    ApplyPartialUndo(file: CADFile)
+    { }
+    //#endregion -----------------------------File End-----------------------------
+}
+class RemoveData extends CADObject
+{
+    index: number;
+
+    //#region -----------------------------File-----------------------------
+    //对象应该实现dataIn和DataOut的方法,为了对象的序列化和反序列化
+    //类名,保证序列化时得到正确的new
+    get ClassName(): string
+    {
+        return "CADObject";
+    }
+    //对象从文件中读取数据,初始化自身
+    FileIn(file: CADFile)
+    { }
+    //对象将自身数据写入到文件.
+    FileOut(file: CADFile)
+    { }
+    //局部撤销
+    ApplyPartialUndo(file: CADFile)
+    { }
+    //#endregion -----------------------------File End-----------------------------
+}
+
+//对象集合.
+class ObjectCollection<T> extends CADObject
+{
+    private objectCol: CADObject[] = [];
+    Append(obj: CADObject)
+    {
+        this.objectCol.push(obj);
+
+        let hisRec = new HistoricRecord();
+        let redo = new AppendData();
+        redo.objData = new CADFile();
+        obj.FileOut(redo.objData);
+        hisRec.redoData = redo;
+
+        let undo = new RemoveData();
+        undo.index = this.objectCol.length - 1;
+        hisRec.undoData = undo;
+
+        this.db.hm.UndoData.WriteObjectHistoryPath(this, hisRec);
+    }
+    Remove(obj: CADObject)
+    {
+        ArrayRemove(this.objectCol, obj);
+
+        this.db.hm.UndoData.WriteObjectHistoryPath(this, undefined);
+    }
+
+    //#region -----------------------------File-----------------------------
+    //对象应该实现dataIn和DataOut的方法,为了对象的序列化和反序列化
+    //类名,保证序列化时得到正确的new
+    get ClassName(): string
+    {
+        return "ObjectCollection";
+    }
+    //对象从文件中读取数据,初始化自身
+    FileIn(file: CADFile)
+    { }
+    //对象将自身数据写入到文件.
+    FileOut(file: CADFile)
+    { }
+    //局部撤销
+    ApplyPartialUndo(file: CADObject)
+    {
+        if (file instanceof AppendData)
+        {
+            file.objData//cad file.
+            //create object
+            //append object
+        }
+        else if (file instanceof RemoveData)
+        {
+            //remove object
+        }
+    }
+    //#endregion -----------------------------File End-----------------------------
+}
+
 //命令历史记录集合
 class CommandHistoryRecord extends CADObject
 {
@@ -253,12 +358,11 @@ class HistoricRecord extends CADObject
     userData: CADObject;
 }
 
-
 //历史记录管理
 class HistoricManage extends CADObject
 {
     private curIndex: number = -1;                       //当前执行位置
-    private historyRecord: CommandHistoryRecord[] = []; //历史记录
+    private historyRecord: CommandHistoryRecord[] = [];  //历史记录
 
     constructor(db: Database)
     {
@@ -507,4 +611,4 @@ console.log(id);
 
 db.hm.Undo();/*?*/
 
-db.hm.Redo();/*?*/
\ No newline at end of file
+db.hm.Redo();/*?*/
diff --git a/src/Common/Utils.ts b/src/Common/Utils.ts
index b6d6a2b46..ed56a7c56 100644
--- a/src/Common/Utils.ts
+++ b/src/Common/Utils.ts
@@ -1,7 +1,6 @@
-import { app } from '../ApplicationServices/Application';
-
-export function log(msg)
+export async function log(msg)
 {
+    let app = (await import("../ApplicationServices/Application")).app;
     app.m_Editor.m_CommandStore.Prompt(msg);
 }