diff --git a/__test__/FileSystem/__snapshots__/file.test.ts.snap b/__test__/FileSystem/__snapshots__/file.test.ts.snap
index c2d384ba0..d1c0f0a1b 100644
--- a/__test__/FileSystem/__snapshots__/file.test.ts.snap
+++ b/__test__/FileSystem/__snapshots__/file.test.ts.snap
@@ -1,12 +1,12 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`changev 1`] = `"[1,3,[\\"BlockTableRecord\\",1,0,false,1,[\\"Line\\",1,1,3,false,7,-1,[1,0,0,0,0,1,0,0,0,0,1,0,0,0,0,1],1,[2,3,4],[0,0,0]]],[\\"MaerialTableRecord\\",1,1,false,0],[\\"ObjectCollection\\",1,2,false,0],1,0,1,[\\"CommandHistoryRecord\\",1,\\"\\",2,0,1,[\\"HistorycRecord\\",1,[\\"RemoveObjectData\\",1,0],[\\"CreateObjectData\\",1,[[\\"Line\\",1,1,3,false,7,-1,[1,0,0,0,0,1,0,0,0,0,1,0,0,0,0,1],1,[0,0,0],[0,0,0]]]],\\"\\"],3,1,[\\"ObjectAllDataHistoryRecord\\",1,1,[\\"AllObjectData\\",1,-1,false,1,[1,1,3,false,7,-1,[1,0,0,0,0,1,0,0,0,0,1,0,0,0,0,1],1,[0,0,0],[0,0,0]]],\\"\\",\\"\\",3]]]"`;
+exports[`changev 1`] = `"[1,3,[\\"BlockTableRecord\\",1,0,false,1,[\\"Line\\",1,1,3,false,7,-1,[1,0,0,0,0,1,0,0,0,0,1,0,0,0,0,1],1,[2,3,4],[0,0,0]]],[\\"MaerialTableRecord\\",1,1,false,0],[\\"ObjectCollection\\",1,2,false,0],1,0,1,[\\"CommandHistoryRecord\\",1,\\"\\",2,0,1,[\\"HistorycRecord\\",1,[\\"RemoveObjectData\\",1,0],[\\"CreateObjectData\\",1,[[\\"Line\\",1,1,3,false,7,-1,[1,0,0,0,0,1,0,0,0,0,1,0,0,0,0,1],1,[0,0,0],[0,0,0]]]],\\"\\"],3,1,[\\"ObjectAllDataHistoryRecord\\",1,1,[\\"AllObjectData\\",1,[1,1,3,false,7,-1,[1,0,0,0,0,1,0,0,0,0,1,0,0,0,0,1],1,[0,0,0],[0,0,0]]],\\"\\",\\"\\",3]]]"`;
 
-exports[`创建 修改 撤销撤销  重做重做  撤销  重做 1`] = `"[1,3,[\\"BlockTableRecord\\",1,0,false,1,[\\"Line\\",1,1,3,false,7,-1,[1,0,0,0,0,1,0,0,0,0,1,0,0,0,0,1],1,[1,2,3],[0,0,0]]],[\\"MaerialTableRecord\\",1,1,false,0],[\\"ObjectCollection\\",1,2,false,0],1,0,1,[\\"CommandHistoryRecord\\",1,\\"\\",2,0,1,[\\"HistorycRecord\\",1,[\\"RemoveObjectData\\",1,0],[\\"CreateObjectData\\",1,[[\\"Line\\",1,1,3,false,7,-1,[1,0,0,0,0,1,0,0,0,0,1,0,0,0,0,1],1,[0,0,0],[0,0,0]]]],\\"\\"],3,1,[\\"ObjectAllDataHistoryRecord\\",1,1,[\\"AllObjectData\\",1,-1,false,1,[1,1,3,false,7,-1,[1,0,0,0,0,1,0,0,0,0,1,0,0,0,0,1],1,[0,0,0],[0,0,0]]],[\\"AllObjectData\\",1,-1,false,1,[1,1,3,false,7,-1,[1,0,0,0,0,1,0,0,0,0,1,0,0,0,0,1],1,[1,2,3],[0,0,0]]],\\"\\",3]]]"`;
+exports[`创建 修改 撤销撤销  重做重做  撤销  重做 1`] = `"[1,3,[\\"BlockTableRecord\\",1,0,false,1,[\\"Line\\",1,1,3,false,7,-1,[1,0,0,0,0,1,0,0,0,0,1,0,0,0,0,1],1,[1,2,3],[0,0,0]]],[\\"MaerialTableRecord\\",1,1,false,0],[\\"ObjectCollection\\",1,2,false,0],1,0,1,[\\"CommandHistoryRecord\\",1,\\"\\",2,0,1,[\\"HistorycRecord\\",1,[\\"RemoveObjectData\\",1,0],[\\"CreateObjectData\\",1,[[\\"Line\\",1,1,3,false,7,-1,[1,0,0,0,0,1,0,0,0,0,1,0,0,0,0,1],1,[0,0,0],[0,0,0]]]],\\"\\"],3,1,[\\"ObjectAllDataHistoryRecord\\",1,1,[\\"AllObjectData\\",1,[1,1,3,false,7,-1,[1,0,0,0,0,1,0,0,0,0,1,0,0,0,0,1],1,[0,0,0],[0,0,0]]],[\\"AllObjectData\\",1,[1,1,3,false,7,-1,[1,0,0,0,0,1,0,0,0,0,1,0,0,0,0,1],1,[1,2,3],[0,0,0]]],\\"\\",3]]]"`;
 
-exports[`创建 修改 撤销撤销  重做重做  撤销  重做 2`] = `"[[\\"HistoricManage\\",1,0,1,[\\"CommandHistoryRecord\\",1,\\"\\",2,0,1,[\\"HistorycRecord\\",1,[\\"RemoveObjectData\\",1,0],[\\"CreateObjectData\\",1,[[\\"Line\\",1,1,3,false,7,-1,[1,0,0,0,0,1,0,0,0,0,1,0,0,0,0,1],1,[0,0,0],[0,0,0]]]],\\"\\"],3,1,[\\"ObjectAllDataHistoryRecord\\",1,1,[\\"AllObjectData\\",1,-1,false,1,[1,1,3,false,7,-1,[1,0,0,0,0,1,0,0,0,0,1,0,0,0,0,1],1,[0,0,0],[0,0,0]]],[\\"AllObjectData\\",1,-1,false,1,[1,1,3,false,7,-1,[1,0,0,0,0,1,0,0,0,0,1,0,0,0,0,1],1,[1,2,3],[0,0,0]]],\\"\\",3]]]]"`;
+exports[`创建 修改 撤销撤销  重做重做  撤销  重做 2`] = `"[[\\"HistoricManage\\",1,0,1,[\\"CommandHistoryRecord\\",1,\\"\\",2,0,1,[\\"HistorycRecord\\",1,[\\"RemoveObjectData\\",1,0],[\\"CreateObjectData\\",1,[[\\"Line\\",1,1,3,false,7,-1,[1,0,0,0,0,1,0,0,0,0,1,0,0,0,0,1],1,[0,0,0],[0,0,0]]]],\\"\\"],3,1,[\\"ObjectAllDataHistoryRecord\\",1,1,[\\"AllObjectData\\",1,[1,1,3,false,7,-1,[1,0,0,0,0,1,0,0,0,0,1,0,0,0,0,1],1,[0,0,0],[0,0,0]]],[\\"AllObjectData\\",1,[1,1,3,false,7,-1,[1,0,0,0,0,1,0,0,0,0,1,0,0,0,0,1],1,[1,2,3],[0,0,0]]],\\"\\",3]]]]"`;
 
-exports[`测试创建 1`] = `"[[\\"AllObjectData\\",1,-1,false,1,[]]]"`;
+exports[`测试创建 1`] = `"[[\\"AllObjectData\\",1,[]]]"`;
 
 exports[`测试创建 2`] = `"[[\\"BlockTableRecord\\",1,-1,false,0]]"`;
 
diff --git a/__test__/FileSystem/file.test.ts b/__test__/FileSystem/file.test.ts
index bf017cd3a..2efb9d965 100644
--- a/__test__/FileSystem/file.test.ts
+++ b/__test__/FileSystem/file.test.ts
@@ -1,9 +1,9 @@
 import * as THREE from 'three';
-
+import { AllObjectData } from '../../src/DatabaseServices/AllObjectData';
 import { BlockTableRecord } from '../../src/DatabaseServices/BlockTableRecord';
 import { CADFactory } from '../../src/DatabaseServices/CADFactory';
 import { CADFile } from '../../src/DatabaseServices/CADFile';
-import { AllObjectData, CADObject } from '../../src/DatabaseServices/CADObject';
+import { CADObject } from '../../src/DatabaseServices/CADObject';
 import { CommandHistoryRecord } from '../../src/DatabaseServices/CommandHistoryRecord';
 import { CreateObjectData } from '../../src/DatabaseServices/CreateObjectData';
 import { Database } from '../../src/DatabaseServices/Database';
diff --git a/src/DatabaseServices/AllObjectData.ts b/src/DatabaseServices/AllObjectData.ts
new file mode 100644
index 000000000..0276f644d
--- /dev/null
+++ b/src/DatabaseServices/AllObjectData.ts
@@ -0,0 +1,39 @@
+import { Factory } from './CADFactory';
+import { CADFile } from './CADFile';
+import { ISerialize } from './ISerialize';
+import { CADObject } from './CADObject';
+/**
+ * 保存对象创建或者修改时的所有数据记录
+ *
+ * @export
+ * @class AllObjectData
+ * @extends {IFileReadWrite}
+ */
+@Factory
+export class AllObjectData implements ISerialize
+{
+    file: CADFile;
+    constructor(obj?: CADObject)
+    {
+        this.file = new CADFile();
+        if (obj)
+            obj.WriteFile(this.file);
+    }
+    //#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
+    //对象从文件中读取数据,初始化自身
+    ReadFile(file: CADFile)
+    {
+        let ver = file.Read();
+        let data = file.Read();
+        this.file.Data = data;
+        return this;
+    }
+    //对象将自身数据写入到文件.
+    WriteFile(file: CADFile)
+    {
+        file.Write(1);
+        file.Write(this.file.Data);
+        return this;
+    }
+}
diff --git a/src/DatabaseServices/CADFile.ts b/src/DatabaseServices/CADFile.ts
index 9cf748094..a58aff268 100644
--- a/src/DatabaseServices/CADFile.ts
+++ b/src/DatabaseServices/CADFile.ts
@@ -69,10 +69,11 @@ export class CADFile
         let className = tempFile.ReadString();
         if (className)
         {
-            if (!obj)
+            if (obj === undefined)
             {
                 obj = CADFactory.CreateObject(className);
-                obj.SetDefaultDb(db);
+                if (db !== undefined && obj instanceof CADObject)
+                    obj.SetDefaultDb(db);
             }
             obj.ReadFile(tempFile);
             tempFile.Destroy();
diff --git a/src/DatabaseServices/CADObject.ts b/src/DatabaseServices/CADObject.ts
index 08b0d394f..9c97965a7 100644
--- a/src/DatabaseServices/CADObject.ts
+++ b/src/DatabaseServices/CADObject.ts
@@ -1,9 +1,10 @@
-import { Factory } from './CADFactory';
 import { CADFile } from './CADFile';
 import { CommandHistoryRecord } from './CommandHistoryRecord';
 import { Database } from './Database';
 import { ISerialize } from './ISerialize';
 import { ObjectId } from './ObjectId';
+import { EraseEntityData } from './EraseEntityData';
+import { AllObjectData } from './AllObjectData';
 
 export abstract class CADObject
 {
@@ -124,7 +125,7 @@ export abstract class CADObject
     {
         let file = new CADFile();
         file.WriteObject(this);
-        let newObject = file.ReadObject(undefined) as this;
+        let newObject = file.ReadObject() as this;
         newObject.objectId = undefined;
         newObject._db = undefined;
         return newObject;
@@ -160,63 +161,3 @@ export abstract class CADObject
         }
     }
 }
-
-/**
- * 保存对象创建或者修改时的所有数据记录
- * 
- * @export
- * @class AllObjectData
- * @extends {IFileReadWrite}
- */
-@Factory
-export class AllObjectData extends CADObject
-{
-    file: CADFile;
-    constructor(obj?: CADObject)
-    {
-        super();
-        this.file = new CADFile();
-        if (obj)
-            obj.WriteFile(this.file);
-    }
-
-    //#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
-
-    //对象从文件中读取数据,初始化自身
-    ReadFile(file: CADFile)
-    {
-        super.ReadFile(file);
-        let ver = file.Read();
-        let data = file.Read();
-        this.file.Data = data;
-        return this;
-    }
-    //对象将自身数据写入到文件.
-    WriteFile(file: CADFile)
-    {
-        super.WriteFile(file);
-        file.Write(1);
-        file.Write(this.file.Data);
-        return this;
-    }
-    //#endregion
-}
-
-@Factory
-export class EraseEntityData implements ISerialize
-{
-    ReadFile(file: CADFile): this
-    {
-        this.isErase = file.Read();
-        return this;
-    }
-    WriteFile(file: CADFile): this
-    {
-        file.Write(this.isErase);
-        return this;
-    }
-    constructor(public isErase = true)
-    {
-    }
-}
diff --git a/src/DatabaseServices/CommandHistoryRecord.ts b/src/DatabaseServices/CommandHistoryRecord.ts
index c84486a63..504350664 100644
--- a/src/DatabaseServices/CommandHistoryRecord.ts
+++ b/src/DatabaseServices/CommandHistoryRecord.ts
@@ -1,6 +1,7 @@
 import { Factory } from './CADFactory';
 import { CADFile } from './CADFile';
-import { CADObject, EraseEntityData } from './CADObject';
+import { CADObject } from './CADObject';
+import { EraseEntityData } from "./EraseEntityData";
 import { HistorycRecord } from './HistorycRecord';
 import { ObjectAllDataHistoryRecord } from './ObjectAllDataHistoryRecord';
 import { ObjectId } from './ObjectId';
diff --git a/src/DatabaseServices/Entity.ts b/src/DatabaseServices/Entity.ts
index 82605745f..1774f3580 100644
--- a/src/DatabaseServices/Entity.ts
+++ b/src/DatabaseServices/Entity.ts
@@ -406,4 +406,3 @@ export class Entity extends CADObject
 
     //#endregion
 }
-
diff --git a/src/DatabaseServices/EraseEntityData.ts b/src/DatabaseServices/EraseEntityData.ts
new file mode 100644
index 000000000..68f1d8c72
--- /dev/null
+++ b/src/DatabaseServices/EraseEntityData.ts
@@ -0,0 +1,20 @@
+import { Factory } from './CADFactory';
+import { CADFile } from './CADFile';
+import { ISerialize } from './ISerialize';
+@Factory
+export class EraseEntityData implements ISerialize
+{
+    ReadFile(file: CADFile): this
+    {
+        this.isErase = file.Read();
+        return this;
+    }
+    WriteFile(file: CADFile): this
+    {
+        file.Write(this.isErase);
+        return this;
+    }
+    constructor(public isErase = true)
+    {
+    }
+}
diff --git a/src/DatabaseServices/ObjectAllDataHistoryRecord.ts b/src/DatabaseServices/ObjectAllDataHistoryRecord.ts
index cc2b20e5f..2f7f5d9da 100644
--- a/src/DatabaseServices/ObjectAllDataHistoryRecord.ts
+++ b/src/DatabaseServices/ObjectAllDataHistoryRecord.ts
@@ -1,6 +1,7 @@
 import { Factory } from './CADFactory';
 import { CADFile } from './CADFile';
-import { AllObjectData, CADObject } from './CADObject';
+import { CADObject } from './CADObject';
+import { AllObjectData } from "./AllObjectData";
 import { HistorycRecord } from './HistorycRecord';
 import { ObjectId } from './ObjectId';