diff --git a/src/DatabaseServices/ObjectCollection.ts b/src/DatabaseServices/ObjectCollection.ts
index 5cebab68f..3f73f6e25 100644
--- a/src/DatabaseServices/ObjectCollection.ts
+++ b/src/DatabaseServices/ObjectCollection.ts
@@ -16,12 +16,11 @@ export class ObjectCollection<T> extends CADObject
     //添加一个对象进入集合,这个集合存在db中,那么将自动分配id.
     Append(obj: CADObject)
     {
-        this.objectCol.push(obj);
-
         if (this._db && !obj.Id)
         {
             obj.InitObjectId(this._db);
         }
+        this.objectCol.push(obj);
 
         let undoRec = this.UndoRecord();
         if (undoRec)