diff --git a/__test__/Polyline/__snapshots__/offset.test.ts.snap b/__test__/Polyline/__snapshots__/offset.test.ts.snap
index 945e1a284..f02659407 100644
--- a/__test__/Polyline/__snapshots__/offset.test.ts.snap
+++ b/__test__/Polyline/__snapshots__/offset.test.ts.snap
@@ -152,3 +152,304 @@ Array [
   ],
 ]
 `;
+
+exports[`中间区域需要圆裁剪 1`] = `
+Array [
+  8,
+  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,
+    2,
+    Array [
+      -1266.7406897021474,
+      -691.805675613746,
+    ],
+    0,
+    Array [
+      -1243.4652905261744,
+      -700.1065279590455,
+    ],
+    0,
+    false,
+  ],
+  Array [
+    "Polyline",
+    1,
+    1,
+    -1,
+    false,
+    2,
+    -1,
+    Array [
+      1,
+      0,
+      0,
+      0,
+      0,
+      1,
+      0,
+      0,
+      0,
+      0,
+      1,
+      0,
+      0,
+      0,
+      0,
+      1,
+    ],
+    2,
+    5,
+    Array [
+      -1278.6992002366314,
+      -725.3370642786467,
+    ],
+    0,
+    Array [
+      -1241.3563766124655,
+      -738.6548708914224,
+    ],
+    0,
+    Array [
+      -1233.6700445337992,
+      -703.5998682903481,
+    ],
+    0,
+    Array [
+      -1266.7406897021474,
+      -691.805675613746,
+    ],
+    0,
+    Array [
+      -1278.6992002366314,
+      -725.3370642786467,
+    ],
+    0,
+    false,
+  ],
+  Array [
+    "Polyline",
+    1,
+    1,
+    -1,
+    false,
+    2,
+    -1,
+    Array [
+      1,
+      0,
+      0,
+      0,
+      0,
+      1,
+      0,
+      0,
+      0,
+      0,
+      1,
+      0,
+      0,
+      0,
+      0,
+      1,
+    ],
+    2,
+    5,
+    Array [
+      -1235.7901881836015,
+      -739.1366800621489,
+    ],
+    0,
+    Array [
+      -1221.9838469756232,
+      -728.4950394202735,
+    ],
+    0,
+    Array [
+      -1243.7169693496471,
+      -700.2987383884769,
+    ],
+    0,
+    Array [
+      -1257.5233105576253,
+      -710.9403790303522,
+    ],
+    0,
+    Array [
+      -1235.7901881836015,
+      -739.1366800621489,
+    ],
+    0,
+    false,
+  ],
+  Array [
+    "Circle",
+    1,
+    1,
+    -1,
+    false,
+    2,
+    -1,
+    Array [
+      1,
+      0,
+      0,
+      0,
+      0,
+      1,
+      0,
+      0,
+      0,
+      0,
+      1,
+      0,
+      -1278.6992002366314,
+      -725.3370642786467,
+      0,
+      1,
+    ],
+    1,
+    35.6,
+  ],
+  Array [
+    "Circle",
+    1,
+    1,
+    -1,
+    false,
+    2,
+    -1,
+    Array [
+      1,
+      0,
+      0,
+      0,
+      0,
+      1,
+      0,
+      0,
+      0,
+      0,
+      1,
+      0,
+      -1241.3563766124655,
+      -738.6548708914224,
+      0,
+      1,
+    ],
+    1,
+    35.6,
+  ],
+  Array [
+    "Circle",
+    1,
+    1,
+    -1,
+    false,
+    2,
+    -1,
+    Array [
+      1,
+      0,
+      0,
+      0,
+      0,
+      1,
+      0,
+      0,
+      0,
+      0,
+      1,
+      0,
+      -1235.7901881836015,
+      -739.1366800621489,
+      0,
+      1,
+    ],
+    1,
+    35.6,
+  ],
+  Array [
+    "Circle",
+    1,
+    1,
+    -1,
+    false,
+    2,
+    -1,
+    Array [
+      1,
+      0,
+      0,
+      0,
+      0,
+      1,
+      0,
+      0,
+      0,
+      0,
+      1,
+      0,
+      -1221.9838469756232,
+      -728.4950394202735,
+      0,
+      1,
+    ],
+    1,
+    35.6,
+  ],
+  Array [
+    "Circle",
+    1,
+    1,
+    -1,
+    false,
+    2,
+    -1,
+    Array [
+      1,
+      0,
+      0,
+      0,
+      0,
+      1,
+      0,
+      0,
+      0,
+      0,
+      1,
+      0,
+      -1198.3915503428952,
+      -730.521482183179,
+      0,
+      1,
+    ],
+    1,
+    35.6,
+  ],
+]
+`;
diff --git a/__test__/Polyline/offset.test.ts b/__test__/Polyline/offset.test.ts
index 604543f3d..a2ae0e8f0 100644
--- a/__test__/Polyline/offset.test.ts
+++ b/__test__/Polyline/offset.test.ts
@@ -681,3 +681,37 @@ describe("不规则不闭合多段线测试", () =>
         }
     })
 })
+
+
+test('提前丢失所有的线段', () =>
+{
+    let f = new CADFile();
+
+    f.Data =
+        [1, ["Polyline", 1, 1, 12, false, 7, -1, [1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, -17.386067452264705, 17.11283965241085, 0, 1], 2, 3, [108.37693694676932, 28.257776463252547], 0.4472440944881872, [108.37693694676932, 17.68555707305448], 3.5940684866260213, [111.70676982557188, 14.089337563947739], 0.5086040192926764, false]]
+
+    f.Read();
+
+    let pl = f.ReadObject() as Polyline;
+
+    let cus = pl.GetOffsetCurves(-7.155086190577401);
+
+    expect(cus.length).toBe(0);
+});
+
+
+test('中间区域需要圆裁剪', () =>
+{
+    let f = new CADFile();
+
+    f.Data =
+        [2, ["Polyline", 1, 1, 3, false, 1, -1, [1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, -1227.4248455167763, -753.9100675211082, 0, 1], 2, 5, [-51.274354719855246, 28.573003242461496], 0, [-13.931531095689206, 15.255196629685734], 3.7897716494829594, [-8.365342666825299, 14.77338745895928], 0, [5.4409985411529185, 25.415028100834675], 0.37399715496699776, [29.033295173881022, 23.38858533792915], 0, false], ["Polyline", 1, 1, 1060, false, 7, -1, [1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1], 2, 2, [-1266.7245873464547, -691.7605249785062], 0, [-1233.6603714182982, -703.5524247546464], 0, false]]
+
+    f.Read();
+
+    let pl = f.ReadObject() as Polyline;
+
+    let cus = pl.GetOffsetCurves(-35.6);
+
+    EntityToMatchSnapshot(cus);
+});