diff --git a/__test__/Polyline/__snapshots__/offset.test.ts.snap b/__test__/Polyline/__snapshots__/offset.test.ts.snap
index ef8e1faf7..1379bcec8 100644
--- a/__test__/Polyline/__snapshots__/offset.test.ts.snap
+++ b/__test__/Polyline/__snapshots__/offset.test.ts.snap
@@ -198,3 +198,115 @@ Array [
   ],
 ]
 `;
+
+exports[`拱门偏移 1`] = `
+Array [
+  1,
+  Array [
+    "Polyline",
+    1,
+    1,
+    -1,
+    false,
+    7,
+    -1,
+    Array [
+      1,
+      0,
+      0,
+      0,
+      0,
+      1,
+      0,
+      0,
+      0,
+      0,
+      1,
+      0,
+      0,
+      0,
+      0,
+      1,
+    ],
+    2,
+    4,
+    Array [
+      0.4,
+      0,
+    ],
+    0,
+    Array [
+      0.4,
+      2,
+    ],
+    -0.9999999999999999,
+    Array [
+      0.6,
+      2,
+    ],
+    0,
+    Array [
+      0.6,
+      -4.898587196589413e-17,
+    ],
+    0,
+    false,
+  ],
+]
+`;
+
+exports[`拱门偏移 2`] = `
+Array [
+  1,
+  Array [
+    "Polyline",
+    1,
+    1,
+    -1,
+    false,
+    7,
+    -1,
+    Array [
+      1,
+      0,
+      0,
+      0,
+      0,
+      1,
+      0,
+      0,
+      0,
+      0,
+      1,
+      0,
+      0,
+      0,
+      0,
+      1,
+    ],
+    2,
+    4,
+    Array [
+      -0.4,
+      0,
+    ],
+    0,
+    Array [
+      -0.4,
+      2,
+    ],
+    -0.9999999999999999,
+    Array [
+      1.4,
+      2,
+    ],
+    0,
+    Array [
+      1.4,
+      4.898587196589413e-17,
+    ],
+    0,
+    false,
+  ],
+]
+`;
diff --git a/__test__/Polyline/offset.test.ts b/__test__/Polyline/offset.test.ts
index af2966470..de74cbab3 100644
--- a/__test__/Polyline/offset.test.ts
+++ b/__test__/Polyline/offset.test.ts
@@ -735,3 +735,22 @@ test('中间区域需要圆裁剪', () =>
 
     EntityToMatchSnapshot(cus);
 });
+
+
+test('拱门偏移', () =>
+{
+    let f = new CADFile();
+
+    f.Data =
+        [1, ["Polyline", 1, 1, 6, false, 7, -1, [1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1], 2, 4, [0, 0], 0, [0, 2], -1, [1, 2], 0, [1, 0], 0, false]]
+
+    f.Read();
+
+    let pl = f.ReadObject() as Polyline;
+
+    let cus = pl.GetOffsetCurves(0.4);
+    EntityToMatchSnapshot(cus);
+
+    cus = pl.GetOffsetCurves(-0.4);
+    EntityToMatchSnapshot(cus);
+});