diff --git a/__test__/Polyline/offset.test.ts b/__test__/Polyline/offset.test.ts
index bb47d3e69..0bf9e8d04 100644
--- a/__test__/Polyline/offset.test.ts
+++ b/__test__/Polyline/offset.test.ts
@@ -248,5 +248,28 @@ test('闭合多段线偏移测试8', () =>
     expect(cus[0].GetOffsetCurves(15).length).toBe(1);
     expect(cus[0].GetOffsetCurves(17.8).length).toBe(2);
     expect(cus[0].GetOffsetCurves(19).length).toBe(3);
+    for (let i = 20; i <= 40; i++)
+    {
+        expect(cus[0].GetOffsetCurves(i).length).toBe(3);
+    }
+    for (let i = 41; i <= 44.3; i += 0.1)
+    {
+        expect(cus[0].GetOffsetCurves(i).length).toBe(2);
+    }
+    expect(cus[0].GetOffsetCurves(45).length).toBe(1);
+    for (let i = 48; i <= 200; i += 10)
+    {
+        expect(cus[0].GetOffsetCurves(i).length).toBe(0);
+    }
+})
+test('闭合多段线偏移测试9', () =>
+{
+    let data =
+        [1, ["Polyline", 1, 1, 12283, false, 2, -1, [1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, -2494.1602062139054, -154.37421492307953, 0, 1], 2, 4, [-835.9056689963722, -81.71614968554674], -1.404257507243489, [-2.5205246091134654, -224.3682931983378], -0.7704346688180675, [-677.9527382520764, -55.635630094036955], 0, [-835.9056689963722, -81.71614968554674], 0, false]];
+    let cus = loadFile(data);
+    //外偏移 -
+
+
+    //内偏移+
 
 })
diff --git a/src/GraphicsSystem/OffestPolyline.ts b/src/GraphicsSystem/OffestPolyline.ts
index d86eb879a..27971c7b8 100644
--- a/src/GraphicsSystem/OffestPolyline.ts
+++ b/src/GraphicsSystem/OffestPolyline.ts
@@ -100,10 +100,7 @@ export class PolyOffestUtil
             if (c.IntersectWith(this.m_Polyline, IntersectOption.OnBothOperands).length !== 0)
                 return false;
             //删除在反方向的无效线段
-            return this.CheckPointDir(c.StartPoint) || this.CheckPointDir(c.EndPoint);
-            // return this.CheckPointDist(c.StartPoint) && this.CheckPointDist(c.EndPoint)
-            // return (this.CheckPointDist(c.StartPoint) && this.CheckPointDist(c.EndPoint))
-            //     && this.CheckPointDir(c.StartPoint);
+            return this.CheckPointDir(c.GetPointAtParam(0.5));
         });
 
         //处理自交的线段
@@ -378,7 +375,14 @@ export class PolyOffestUtil
             let par2 = laterLine.GetParamAtPoint(intPt);
             if (par1 > 1)
             {
-                this.appendNewCuAndContour(frontLine, nextPt, intPt, startIndex);
+                if (par2 > 1 && laterLine instanceof Arc)
+                {
+                    this.fillArc(endIndex - 1, endIndex, nextPt, frontLine, laterLine);
+                }
+                else
+                {
+                    this.appendNewCuAndContour(frontLine, nextPt, intPt, startIndex);
+                }
             }
             else if (frontLine instanceof Arc && par1 < 0 && par2 < 0)
             {