diff --git a/src/utils/service.ts b/src/utils/service.ts
index 166039d0730f2f9b48aafe5f3f82db033f1167fa..4d40a2fb43795f4dba89765132ce0f3412d86ed0 100644
--- a/src/utils/service.ts
+++ b/src/utils/service.ts
@@ -20,10 +20,10 @@ function getShapeFormBox(model: IExportParamModelData) {
   const { size } = model;
   const center = { x: 0, y: 0, z: 0 }
   const points = [
-    { x: center.x - size.x, y: center.y - size.y },
-    { x: center.x - size.x, y: center.y + size.y },
-    { x: center.x + size.x, y: center.y + size.y },
-    { x: center.x + size.x, y: center.y - size.y },
+    { x: center.x - size.x / 2, y: center.y - size.y / 2 },
+    { x: center.x - size.x / 2, y: center.y + size.y / 2 },
+    { x: center.x + size.x / 2, y: center.y + size.y / 2 },
+    { x: center.x + size.x / 2, y: center.y - size.y / 2 },
   ];
   const thickness = size.z;
   return { points, thickness };