diff --git a/src/Add-on/Fillet.ts b/src/Add-on/Fillet.ts
index 61adf77ee..b6c14e17b 100644
--- a/src/Add-on/Fillet.ts
+++ b/src/Add-on/Fillet.ts
@@ -364,35 +364,47 @@ export class CommandFillet implements Command
         if (res && res.arc)
         {
             let pln = pl.Clone();
+            //修正凸度
             if (res.cu1 instanceof Arc)
                 pln.SetBulgeAt(parF1, res.cu1.Bul);
             if (res.cu2 instanceof Arc)
                 pln.SetBulgeAt(parF2, res.cu2.Bul);
 
-            let sp = res.arc.StartPoint.applyMatrix4(pln.OCSInv);
-            let ep = res.arc.EndPoint.applyMatrix4(pln.OCSInv);
-            if (rem === 1)
+            let sp2d = Vec3DTo2D(res.arc.StartPoint.applyMatrix4(pln.OCSInv));
+            let ep2d = Vec3DTo2D(res.arc.EndPoint.applyMatrix4(pln.OCSInv));
+
+            let isNeighbor = rem === 1;
+
+            //#IOX26
+            if (isNeighbor && res.cu1 instanceof Arc && res.cu2 instanceof Arc)
             {
-                pln.SetPointAt(parF2, Vec3DTo2D(ep));
-                pln.AddVertexAt(parF2, Vec3DTo2D(sp));
+                let ins = res.cu1.IntersectWith(res.cu2, IntersectOption.OnBothOperands);
+                if (ins.length === 1 && !equalv3(pln.StartPoint, ins[0]))
+                    isNeighbor = false;
+            }
+
+            if (isNeighbor)
+            {
+                pln.SetPointAt(parF2, ep2d);
+                pln.AddVertexAt(parF2, sp2d);
                 pln.SetBulgeAt(parF2, res.arc.Bul);
             }
             else//首尾
             {
-                let oldBul = pln.GetBuilgeAt(0);
-                pln.StartPoint = sp;
-                pln.SetBulgeAt(0, oldBul);
+                pln.SetPointAt(0, sp2d);
+
                 let plPtCount = pln.NumberOfVertices;
                 if (pln.EndParam === plPtCount)//CloseMark
                 {
-                    pln.AddVertexAt(plPtCount, Vec3DTo2D(ep));
+                    pln.AddVertexAt(plPtCount, ep2d);
                     pln.SetBulgeAt(plPtCount, -res.arc.Bul);
                 }
                 else
                 {
-                    pln.EndPoint = ep;
+                    pln.SetPointAt(plPtCount - 1, ep2d);
+
                     pln.SetBulgeAt(plPtCount - 1, -res.arc.Bul);
-                    pln.AddVertexAt(plPtCount, Vec3DTo2D(sp));
+                    pln.AddVertexAt(plPtCount, sp2d);
                 }
             }
 
diff --git a/src/DatabaseServices/Polyline.ts b/src/DatabaseServices/Polyline.ts
index 297ceb979..b35c2f2a9 100644
--- a/src/DatabaseServices/Polyline.ts
+++ b/src/DatabaseServices/Polyline.ts
@@ -235,17 +235,26 @@ export class Polyline extends Curve
             return Vec2DTo3D(this.m_LineData[0].pt).applyMatrix4(this.OCS);
         return new Vector3();
     }
-    set StartPoint(v: Vector3)
+    set StartPoint(p: Vector3)
     {
         this.WriteAllObjectRecord();
-        this.SetPointAt(0, Vec3DTo2D(v));
-        let bul = this.GetBuilgeAt(0)
-        if (bul !== 0)
+        p = p.clone().applyMatrix4(this.OCSInv);
+
+        if (this.m_LineData.length === 0)
+            this.AddVertexAt(0, Vec3DTo2D(p));
+        else if (this.m_LineData.length === 1)
+            this.SetPointAt(0, Vec3DTo2D(p));
+        else
         {
-            let arc = this.GetCurveAtParam(0) as Arc;
-            arc.StartPoint = v;
-            //前面线的凸度调整
-            this.SetBulgeAt(0, Math.tan(arc.AllAngle / 4) * Math.sign(bul));
+            let bul = this.GetBuilgeAt(0)
+            if (bul !== 0)
+            {
+                let arc = this.GetCurveAtParam(0) as Arc;
+                arc.StartPoint = p;
+                //前面线的凸度调整
+                this.SetBulgeAt(0, Math.tan(arc.AllAngle / 4) * Math.sign(bul));
+            }
+            this.SetPointAt(0, Vec3DTo2D(p));
         }
     }
     get EndPoint()
@@ -255,21 +264,24 @@ export class Polyline extends Curve
             return Vec2DTo3D(this.m_LineData[this.EndParam].pt).applyMatrix4(this.OCS);
         return new Vector3();
     }
-    set EndPoint(v: Vector3)
+    set EndPoint(p: Vector3)
     {
-        this.WriteAllObjectRecord();
-        this.SetPointAt(this.EndParam, Vec3DTo2D(v));
-        if (this.EndParam === 0)
+        if (this.m_LineData.length < 2 || this.CloseMark)
             return;
 
+        this.WriteAllObjectRecord();
+        p = p.clone().applyMatrix4(this.OCSInv);
+
         let bul = this.GetBuilgeAt(this.EndParam - 1)
         if (bul !== 0)
         {
-            let arc = this.GetCurveAtParam(0) as Arc;
-            arc.EndPoint = v;
+            let arc = this.GetCurveAtParam(this.EndParam - 1) as Arc;
+            arc.ApplyMatrix(this.OCSInv);
+            arc.EndPoint = p;
             //前面线的凸度调整
             this.SetBulgeAt(this.EndParam - 1, Math.tan(arc.AllAngle / 4) * Math.sign(bul));
         }
+        this.SetPointAt(this.EndParam, Vec3DTo2D(p));
     }
     get StartParam()
     {