diff --git a/__test__/Geometry/intersect.test.ts b/__test__/Geometry/intersect.test.ts
index b8f77f5c4..0afe5bc24 100644
--- a/__test__/Geometry/intersect.test.ts
+++ b/__test__/Geometry/intersect.test.ts
@@ -90,7 +90,19 @@ test('三维空间直线和圆相交测试', () =>
     testLineAndCirIntersect(data);
 })
 
-
+test('补充相交测试', () =>
+{
+    let data = [["Line", 1, 1, 2308, false, 7, -1, [1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 1.3934337707580937, 0.039495588796686576, 0, 1], 1, [12.270990240675426, 8.520323796959827, 0], [12.270990240675426, 4.4951100391838885, 0]], ["Arc", 1, 1, 2313, false, 7, -1, [1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 13.662687223232803, 4.584664645783669, 0, 1], 2, 0.003163048700428762, 6.156784789283385, 3.3367334474492862, true]]
+    let cus = loadFile(data);
+    let [cu1, cu2] = cus[0] instanceof Line ? cus : cus.reverse();
+    let pts = cu1.IntersectWith(cu2, 0);
+    expect(pts.length).toBe(1);
+    data = [["Line", 1, 1, 2308, false, 7, -1, [1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 1.3934337707580937, 0.039495588796686576, 0, 1], 1, [12.270990240675426, 8.520323796959827, 0], [12.270990240675426, 4.4951100391838885, 0]], ["Circle", 1, 1, 2320, false, 7, -1, [1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 13.662687223232803, 4.584664645783669, 0, 1], 1, 0.0031630487004287015]];
+    cus = loadFile(data);
+    [cu1, cu2] = cus[0] instanceof Line ? cus : cus.reverse();
+    pts = cu1.IntersectWith(cu2, 0);
+    expect(pts.length).toBe(2);
+})
 function loadFile(data)
 {
     let file = new CADFile();
diff --git a/__test__/Polyline/offset.test.ts b/__test__/Polyline/offset.test.ts
index 82b5d5178..b9fc8d02a 100644
--- a/__test__/Polyline/offset.test.ts
+++ b/__test__/Polyline/offset.test.ts
@@ -1,8 +1,21 @@
 import { Factory } from "../../src/DatabaseServices/CADFactory";
 import { CADFile } from "../../src/DatabaseServices/CADFile";
 import { Polyline } from "../../src/DatabaseServices/Polyline";
+import { Curve } from "../../src/DatabaseServices/Curve";
 Factory(Polyline);
 
+function loadFile(data)
+{
+    let file = new CADFile();
+    file.Data = data;
+    let cus: Curve[] = [];
+    for (let i = 0; i < file.Data.length; i++)
+    {
+        cus.push(file.ReadObject(undefined) as Curve);
+    }
+    return cus;
+}
+
 test('IKKGK圆与直线补圆弧', () =>
 {
     let f = new CADFile();
@@ -37,3 +50,57 @@ test('IKKGK圆与直线补圆弧', () =>
     cus = pl.GetOffsetCurves(-1.926388985025112);
     expect(cus.length).toBe(1);
 });
+
+test('多段线偏移测试1', () =>
+{
+    let data = [["Polyline", 1, 1, 3, false, 7, -1, [1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1], 2, 4, [6.059716713881022, 3.983456090651555], 1.1217395195062214, [6.383002832861191, 4.064022662889515], 0, [4.929178470254959, 8.399433427762037], 1.2642365052895204, [5.750708215297452, 4.050991501416427], 0.7171789779484218, true]];
+
+    let cus = loadFile(data);
+    for (let i = 0; i < 10; i += 0.01)
+    {
+        expect(cus[0].GetOffsetCurves(i).length).toBe(1);
+    }
+    for (let i = -1.5; i < 0; i += 0.01)
+    {
+        expect(cus[0].GetOffsetCurves(i).length).toBe(1);
+    }
+    for (let i = 2; i < 10; i += 0.01)
+    {
+        expect(cus[0].GetOffsetCurves(-i).length).toBe(0);
+    }
+})
+test('多段线偏移测试2', () =>
+{
+    let data = [["Polyline", 1, 1, 734, false, 7, -1, [1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1], 2, 4, [8.176442643449754, 4.003694129881114], 0.6482011490054378, [8.554554536583165, 4.090460859042256], 0, [7.7292787370841225, 8.733182129315965], 0, [7.8227800907745895, 4.037582052934876], 1.223388515290821, true]];
+
+    let cus = loadFile(data);
+    expect(cus[0].GetOffsetCurves(-0.1799).length).toBe(2);
+
+    for (let i = 0; i < 10; i += 1)
+    {
+        expect(cus[0].GetOffsetCurves(i).length).toBe(1);
+    }
+    for (let i = -0.17; i < 0; i += 0.01)
+    {
+        expect(cus[0].GetOffsetCurves(i).length).toBe(1);
+    }
+    for (let i = -0.18; i < -0.34; i -= 0.01)
+    {
+        expect(cus[0].GetOffsetCurves(i).length).toBe(1);
+    }
+    for (let i = 0.35; i < 3; i += 0.01)
+    {
+        expect(cus[0].GetOffsetCurves(-i).length).toBe(0);
+    }
+})
+test('多段线偏移测试3', () =>
+{
+    let data = [["Polyline", 1, 1, 1172, false, 7, -1, [1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1], 2, 5, [12.52535684411379, 4.512623511896158], 0.39558516940595195, [13.121416971132648, 4.487590129452889], 0, [12.414545456418505, 8.796498405316765], 0, [12.015990240675425, 8.743859037199755], 0, [12.015990240675425, 4.4951100391838885], 0.8508932598252141, true]];
+
+    let cus = loadFile(data);
+    for (let i = 0; i < 10; i += 1)
+    {
+        expect(cus[0].GetOffsetCurves(i).length).toBe(1);
+    }
+
+})
diff --git a/src/Add-on/Offset.ts b/src/Add-on/Offset.ts
index 70a66d012..7c864d1fd 100644
--- a/src/Add-on/Offset.ts
+++ b/src/Add-on/Offset.ts
@@ -74,10 +74,6 @@ export class Command_TestOffset implements Command
                     let dir = GetPointAtCurveDir(cu, p) ? 1 : -1
                     lastpls = cu.GetOffsetCurves(p.distanceTo(cu.GetClosestPointTo(p, !cu.IsClose)) * dir);
 
-                    // let a = cu.GetOffsetCurves(p.distanceTo(cu.GetClosestPointTo(p, !cu.IsClose)) * -dir);
-                    // a.forEach(c => c.ColorIndex = 2);
-                    // lastpls.push(...a);
-
                     lastpls.forEach((offCur) =>
                     {
                         app.m_Database.ModelSpace.Append(offCur);
diff --git a/src/Add-on/test/testIntersect.ts b/src/Add-on/test/testIntersect.ts
index 7e3cdb11f..5129725a4 100644
--- a/src/Add-on/test/testIntersect.ts
+++ b/src/Add-on/test/testIntersect.ts
@@ -94,7 +94,7 @@ export class TestIntersect implements Command
         let cus = exRefSsRes.SelectSet.SelectEntityList as Curve[];
         if (cus.length === 2)
         {
-            let pt = cus[0].IntersectWith(cus[1], IntersectOption.ExtendBoth);
+            let pt = cus[0].IntersectWith(cus[1], 0);
             console.log('pt: ', pt);
             if (pt.length)
             {
diff --git a/src/Add-on/testEntity/TestCurve.ts b/src/Add-on/testEntity/TestCurve.ts
index 1c8811ff4..c698d61c4 100644
--- a/src/Add-on/testEntity/TestCurve.ts
+++ b/src/Add-on/testEntity/TestCurve.ts
@@ -6,6 +6,9 @@ import { Curve } from "../../DatabaseServices/Curve";
 import { Polyline } from "../../DatabaseServices/Polyline";
 import { Command } from "../../Editor/CommandMachine";
 import { PromptStatus } from "../../Editor/PromptResult";
+import { arraySortByNumber, arrayLast, arrayRemoveIf } from "../../Common/ArrayExt";
+import { equaln } from "../../Geometry/GeUtils";
+import { IsPtsAllOutOrOnReg } from "../../GraphicsSystem/BoolOperateUtils";
 
 export class TestTargeOnCurve implements Command
 {
@@ -29,14 +32,19 @@ export class TestTargeOnCurve implements Command
             {
                 let target = ssRes.SelectSet.SelectEntityList[0] as Curve;
 
-                let con1 = Contour.CreateContour([source]);
-                let con2 = Contour.CreateContour([target]);
-                let res = con1.getOperatedCurves(con2);
-                testCurve(res.unionList, 1);
-                testCurve(res.intersectionList, 2);
-                testCurve(res.subtractList, 3);
-                target.Erase();
-                source.Erase();
+                // let con1 = Contour.CreateContour([source]);
+                // let con2 = Contour.CreateContour([target]);
+                // let res = con1.getOperatedCurves(con2);
+                // testCurve(res.unionList, 1);
+                // testCurve(res.intersectionList, 2);
+                // testCurve(res.subtractList, 3);
+                this.testClip(source as Polyline, target).forEach((c, i) =>
+                {
+                    c.ColorIndex = i + 1;
+                    app.m_Database.ModelSpace.Append(c);
+                })
+                // target.Erase();
+                // source.Erase();
 
             }
         } catch (err)
@@ -44,7 +52,45 @@ export class TestTargeOnCurve implements Command
             console.log(err);
         }
     }
+    testClip(outline: Polyline, l: Curve)
+    {
+        let tmpCus = [];
+        //交点参数列表
+        let iParams = l.IntersectWith(outline, 0)
+            .map(p => l.GetParamAtPoint(p));
+        arraySortByNumber(iParams);
+
+        //需要计算的点列表
+        let needCaclPts: Vector3[] = [];
+        for (let i = 0; i < iParams.length - 1; i++)
+        {
+            needCaclPts.push(l.GetPointAtParam((iParams[i] + iParams[i + 1]) / 2));
+        }
+        //如果交点不是首尾点,就加入首尾点
+        if (!equaln(iParams[0], 0, 1e-6))
+            needCaclPts.unshift(l.StartPoint);
+        if (!equaln(arrayLast(iParams), 1, 1e-6))
+            needCaclPts.push(l.EndPoint);
+
+        //切割曲线,缓存切割后曲线包围盒
+        if (IsPtsAllOutOrOnReg(outline, needCaclPts))
+        {
+            tmpCus.push(l);
+        }
+        else
+        {
+            let cus = l.GetSplitCurves(iParams);
+
+            //移除0长度线和在轮廓内的线.
+            arrayRemoveIf(cus, cu => equaln(cu.Length, 0, 1e-6)
+                || outline.PtInCurve(cu.GetPointAtParam(0.5))
+            );
+            tmpCus.push(...cus);
+        }
+        return tmpCus;
+    }
 }
+
 export function testPts(pts: Vector3[], color = 2)
 {
     pts.forEach(p =>
diff --git a/src/GraphicsSystem/IntersectWith.ts b/src/GraphicsSystem/IntersectWith.ts
index 34fe4edff..3a081ab7f 100644
--- a/src/GraphicsSystem/IntersectWith.ts
+++ b/src/GraphicsSystem/IntersectWith.ts
@@ -165,7 +165,7 @@ function IntersectLineAndCircleOrArc(line: Line, circle: Circle | Arc)
     let c = center.lengthSq() + startPoint.lengthSq() - 2 * center.dot(startPoint) - radius * radius;
     let det = b * b - 4 * a * c;
 
-    if (equaln(det, 0))
+    if (equaln(det, 0, 1e-4))
     {
         let delta = -b / (2 * a);
         return [startPoint.add(lineV.multiplyScalar(delta))];
diff --git a/src/GraphicsSystem/OffestPolyline.ts b/src/GraphicsSystem/OffestPolyline.ts
index 3e31ff227..1bbd640a6 100644
--- a/src/GraphicsSystem/OffestPolyline.ts
+++ b/src/GraphicsSystem/OffestPolyline.ts
@@ -12,6 +12,7 @@ import { equal, equaln } from "../Geometry/GeUtils";
 import { EBox, SortEntityByBox } from "../Geometry/SortEntityByBox";
 import { IsPtsAllOutOrOnReg } from "./BoolOperateUtils";
 import { IntersectOption } from "./IntersectWith";
+import { testContours } from "../Add-on/testEntity/TestCurve";
 
 interface offestRes
 {
@@ -52,14 +53,18 @@ export class PolyOffestUtil
         // console.time("join")
         this.TrimAndBuildContour(offres);
         // console.timeEnd("join")
-        // testContours(this.m_Contours);
+        testContours(this.m_Contours);
         //裁剪
         let { boxCurves, outputCus } = this.trimByContours(this.m_RetCurves);
-
-        // 优化裁剪后的曲线
-        outputCus = this.optimizeCus(boxCurves, outputCus);
-        outputCus.push(...this.unNeedCutCus);
-        return this.linkCurves(outputCus);
+        // // 优化裁剪后的曲线
+        // this.m_RetCurves = this.optimizeCus(boxCurves, outputCus);
+        // this.m_RetCurves.push(...this.unNeedCutCus);
+
+        // this.m_RetCurves = this.linkCurves(this.m_RetCurves);
+        // // 如果源线段闭合只保留闭合的部分
+        // if (this.m_Polyline.IsClose)
+        //     return this.m_RetCurves.filter(c => c.IsClose);
+        return this.m_RetCurves;
     }
 
     /**
@@ -84,18 +89,22 @@ export class PolyOffestUtil
     }
     private optimizeCus(boxCurves: Map<EBox, Box3>, outputCus: Curve[])
     {
-        //过滤掉无效的线段
-        outputCus = outputCus.filter(c =>
+        if (!this.m_Polyline.IsClose)
         {
-            //与源线段自交
-            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);
-            // return this.CheckPointDist(c.StartPoint) && this.CheckPointDist(c.EndPoint)
-            // return (this.CheckPointDist(c.StartPoint) && this.CheckPointDist(c.EndPoint))
-            //     && this.CheckPointDir(c.StartPoint);
-        });
+            //过滤掉无效的线段
+            outputCus = outputCus.filter(c =>
+            {
+                //与源线段自交
+                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);
+            });
+        }
+
 
         //处理自交的线段
         let count = outputCus.length;
@@ -358,7 +367,7 @@ export class PolyOffestUtil
             {
                 this.appendNewCuAndContour(frontLine, nextPt, intPt, startIndex);
             }
-            else if (frontLine instanceof Arc && par1 < 0 && par2 < 1)
+            else if (frontLine instanceof Arc && par1 < 0 && par2 < 0)
             {
                 this.appendNewCuAndContour(frontLine, nextPt, intPt, startIndex);
             }