diff --git a/__test__/FileSystem/file.test.ts b/__test__/FileSystem/file.test.ts
index 961b640b9..11d4f7181 100644
--- a/__test__/FileSystem/file.test.ts
+++ b/__test__/FileSystem/file.test.ts
@@ -77,13 +77,13 @@ test('xxx', () =>
     (id1.Object as Line).EndPoint = new Vector3(2, 2, 2);
     let file = db.FileOut();
     console.log(file.ToString());
-});
 
+    console.log(JSON.stringify(db.ObjectOut()));
+});
 
 
 CADFactory.RegisterObject(Line);
 let l = CADFactory.CreateObject("Line");
-console.log(l);
 
 l.ClassName //?
 
diff --git a/src/DatabaseServices/FileSystem.ts b/src/DatabaseServices/FileSystem.ts
index b45cf95c8..485da8a36 100644
--- a/src/DatabaseServices/FileSystem.ts
+++ b/src/DatabaseServices/FileSystem.ts
@@ -123,6 +123,20 @@ export class CADFactory
         if (createF)
             return createF();
     }
+
+    static ReadObject(data: any, db: Database): CADObject
+    {
+        if (data.className)
+        {
+            let obj = this.CreateObject(data.className);
+            if (obj)
+            {
+                obj.SetDefaultDb(db);
+                obj.ObjectIn(data);
+                return obj
+            }
+        }
+    }
 }
 
 //所有cad对象的基类
@@ -211,6 +225,17 @@ export class CADObject
     {
         this.WriteObjectId(file)
     }
+    ObjectIn(obj: any)
+    {
+        this.objectId = ObjectId.Create(this._db, obj.id);
+    }
+    ObjectOut(): Object
+    {
+        return {
+            className: this.ClassName,
+            id: this.Id.Index
+        };
+    }
     //局部撤销
     ApplyPartialUndo(file: CADObject)
     {
@@ -271,7 +296,7 @@ export class ObjectId
     static Create(db: Database, index: number): ObjectId
     {
         let id = db.GetObjectId(index);
-        if (!id)
+        if (!id && index >= 0)
         {
             id = new ObjectId(index);
             db.SetObjectId(index, id);
@@ -489,6 +514,19 @@ export class ObjectCollection<T> extends CADObject
             file.WriteObject(obj);
         }
     }
+
+    ObjectIn(obj: any)
+    {
+        super.ObjectIn(obj);
+        let objList: Object[] = obj.objectCol;
+        this.objectCol = objList.map(o => CADFactory.ReadObject(o, this._db));
+    }
+    ObjectOut(): Object
+    {
+        let obj = super.ObjectOut() as any;
+        obj.objectCol = this.objectCol.map(o => o.ObjectOut());
+        return obj;
+    }
     //局部撤销
     ApplyPartialUndo(undoData: CADObject)
     {
@@ -662,6 +700,19 @@ export class Database
         this.idCout = file.Read();
         this.ModelSpace.FileIn(file);
     }
+
+
+    ObjectIn(obj: any)
+    {
+    }
+    ObjectOut(): Object
+    {
+        return {
+            idCout: this.idCout,
+            ms: this.ModelSpace.ObjectOut(),
+        }
+    }
+
     //创建一个id,自动递增它的索引号,并且会自动加入到db的id列表中.
     AllocateId(obj: CADObject): ObjectId
     {
@@ -776,6 +827,18 @@ export class Line extends Entity
         file.Write(this.startPoint.toArray());
         file.Write(this.endPoint.toArray());
     }
+
+    ObjectIn(obj: any)
+    {
+    }
+    ObjectOut(): Object
+    {
+        let obj = super.ObjectOut() as any;
+        obj.sp = this.startPoint.toArray();
+        obj.ep = this.endPoint.toArray();
+        return obj
+    }
+
     ApplyPartialUndo(data)
     {
     }