diff --git a/src/Add-on/JiaJu/Import/JiaJuImport.ts b/src/Add-on/JiaJu/Import/JiaJuImport.ts
index 2ba9e6e32..2f80e897d 100644
--- a/src/Add-on/JiaJu/Import/JiaJuImport.ts
+++ b/src/Add-on/JiaJu/Import/JiaJuImport.ts
@@ -4,6 +4,7 @@ import { app } from "../../../ApplicationServices/Application";
 import { EBoardKeyList } from "../../../Common/BoardKeyList";
 import { FileSystem } from "../../../Common/FileSystem";
 import { JigMoveEntity } from "../../../Common/JigMove";
+import { MakeMirrorMtx } from "../../../Common/Matrix4Utils";
 import { Contour } from "../../../DatabaseServices/Contour";
 import { Database } from "../../../DatabaseServices/Database";
 import { Arc } from "../../../DatabaseServices/Entity/Arc";
@@ -12,10 +13,11 @@ import { Entity } from "../../../DatabaseServices/Entity/Entity";
 import { Line } from "../../../DatabaseServices/Entity/Line";
 import { Polyline } from "../../../DatabaseServices/Entity/Polyline";
 import { HardwareCompositeEntity } from "../../../DatabaseServices/Hardware/HardwareCompositeEntity";
+import { ObjectId } from "../../../DatabaseServices/ObjectId";
 import { Shape } from "../../../DatabaseServices/Shape";
 import { TemplateRecord } from "../../../DatabaseServices/Template/TemplateRecord";
 import { Command, CommandWrap } from "../../../Editor/CommandMachine";
-import { equaln, XAxis, YAxis, ZAxis } from "../../../Geometry/GeUtils";
+import { equaln, XAxis, YAxis, ZAxis, ZeroVec } from "../../../Geometry/GeUtils";
 import { AppToaster } from "../../../UI/Components/Toaster";
 import { BoardType, FaceDirection, LinesType } from "../../../UI/Store/BoardInterface";
 import { CuttingBoardByBoard } from "../../BoardCutting/CuttingUtils2";
@@ -310,6 +312,15 @@ class JiaJuParse
         //坐标系变换
         //旋转
         br.ApplyMatrix(roMat);
+        if (br.BoardType === BoardType.Behind)
+        {
+            br.objectId = new ObjectId;
+            br.ApplyMatrix(MakeMirrorMtx(YAxis, ZeroVec));
+            br.objectId = undefined;
+            br.SetXAxis(XAxis, true);
+        }
+        else if (br.BoardType === BoardType.Layer)
+            br.SetXAxis(YAxis, true);
 
         //左后下
         let box = br.BoundingBox;