diff --git a/src/GraphicsSystem/OffestPolyline.ts b/src/GraphicsSystem/OffestPolyline.ts
index 19f1aeb0b..0ef4350de 100644
--- a/src/GraphicsSystem/OffestPolyline.ts
+++ b/src/GraphicsSystem/OffestPolyline.ts
@@ -10,6 +10,7 @@ import { Polyline, PolylineProps } from '../DatabaseServices/Polyline';
 import { equal, equaln } from "../Geometry/GeUtils";
 import { isTargetCurInSourceCur, isTargetCurOutOrOnSourceCur } from "./BoolOperateUtils";
 import { IntersectOption } from "./IntersectWith";
+import { app } from "../ApplicationServices/Application";
 interface offestRes
 {
     index: number,
@@ -1072,10 +1073,16 @@ export class PolyOffestUtil3
         {
             contours.push(this.buildContourByTwoSideOfest(plList1[i].pl, plList2[i].pl));
         }
+        // contours.forEach(c =>
+        // {
+        //     c.Outline.ColorIndex = 3;
+        //     app.m_Database.ModelSpace.Append(c.Outline);
+        // })
         let newPls = this.trimAndJointOffestPolyline(plList1, this.m_Polyline);
 
         let cus = this.trimByContours(newPls, contours);
 
+        // return cus;
         if (this.m_Polyline.IsClose && this.offDir < 0)
         {
             cus = cus.filter(pl => isTargetCurInSourceCur(this.m_Polyline, pl))
@@ -1107,7 +1114,7 @@ export class PolyOffestUtil3
     {
         if (!pl1 || !pl2)
         {
-            let arc = pl1 ? pl1 as Arc : pl2 as Arc;
+            let arc = pl1 ? pl1.Clone() as Arc : pl2.Clone() as Arc;
             let l1 = new Line(arc.Center, arc.StartPoint);
             let l2 = new Line(arc.Center, arc.EndPoint);
             return new Contour([arc, l1, l2]);
@@ -1115,8 +1122,8 @@ export class PolyOffestUtil3
         else
         {
             let dir = Math.sign(this.m_OffestDist)
-            let arc1 = new Arc().ParseFromBul(pl1.StartPoint, pl2.StartPoint, -dir);
-            let arc2 = new Arc().ParseFromBul(pl1.EndPoint, pl2.EndPoint, dir);
+            let arc1 = new Arc().ParseFromBul(pl1.StartPoint.clone(), pl2.StartPoint.clone(), -dir);
+            let arc2 = new Arc().ParseFromBul(pl1.EndPoint.clone(), pl2.EndPoint.clone(), dir);
 
             return new Contour([pl1.Clone() as Curve, pl2.Clone() as Curve, arc1, arc2]);
         }
@@ -1228,12 +1235,15 @@ export class PolyOffestUtil3
         {
             let pars = [nextPt, intPt].map(p => cir1.GetParamAtPoint(p));
             let splitCus = cir1.GetSplitCurves(pars);
-            let cu = splitCus[0].Length < splitCus[1].Length ? splitCus[0] : splitCus[1];
+            if (splitCus.length === 2)
+            {
+                let cu = splitCus[0].Length < splitCus[1].Length ? splitCus[0] : splitCus[1];
 
-            //如果不是首尾相连,就反转后在存入数组
-            if (!equal(cu.StartPoint, arrayLast(newPlList).EndPoint)) cu.Reverse();
-            newPlList.push(cu);
-            nextPt.copy(intPt);
+                //如果不是首尾相连,就反转后在存入数组
+                if (!equal(cu.StartPoint, arrayLast(newPlList).EndPoint)) cu.Reverse();
+                newPlList.push(cu);
+                nextPt.copy(intPt);
+            }
         }
 
         if (!equaln(startDist, endDist))