diff --git a/__test__/Polyline/polyline.test.ts b/__test__/Polyline/polyline.test.ts
index c726e0371..bf66aac12 100644
--- a/__test__/Polyline/polyline.test.ts
+++ b/__test__/Polyline/polyline.test.ts
@@ -440,7 +440,7 @@ describe('多段线', () =>
                 bul: 0
             }
         ])
-        expect(pl.BoundingBox.getSize()).toEqual(new Vector3(7.5, 10, 0))
+        expect(pl.BoundingBox.getSize(new Vector3())).toEqual(new Vector3(7.5, 10, 0))
 
     })
     test("多段线反转", () =>