diff --git a/src/Add-on/DrawSpline.ts b/src/Add-on/DrawSpline.ts
index 1512b49f0..ce4196f81 100644
--- a/src/Add-on/DrawSpline.ts
+++ b/src/Add-on/DrawSpline.ts
@@ -47,6 +47,8 @@ export class DrawSpline implements Command
             }
             else
             {
+                // 弹出预存点
+                pts.pop();
                 break;
             }
         }
diff --git a/src/DatabaseServices/Spline.ts b/src/DatabaseServices/Spline.ts
index e46f2298b..0557554bf 100644
--- a/src/DatabaseServices/Spline.ts
+++ b/src/DatabaseServices/Spline.ts
@@ -1,31 +1,74 @@
 import * as THREE from 'three';
 import { Geometry, Object3D, Vector3 } from 'three';
+import { arrayLast } from '../Common/ArrayExt';
 import { ColorMaterial } from '../Common/ColorPalette';
 import { RenderType } from '../GraphicsSystem/Enum';
 import { Factory } from './CADFactory';
-import { Entity } from './Entity';
+import { CADFile } from './CADFile';
+import { Curve } from './Curve';
 
 
 @Factory
-export class Spline extends Entity
+export class Spline extends Curve
 {
-    private m_Points: Vector3[];
+    private m_PointList: Vector3[];
     constructor(points?: Vector3[])
     {
         super();
-        this.m_Points = points || [];
+        this.m_PointList = points || [];
     }
     get Points()
     {
-        return this.m_Points;
+        return this.m_PointList;
     }
     set Points(v: Vector3[])
     {
         this.WriteAllObjectRecord();
-        this.m_Points = v;
+        this.m_PointList = v;
         this.Update();
     }
-
+    get StartPoint()
+    {
+        return this.m_PointList[0];
+    }
+    get EndPoint()
+    {
+        return arrayLast(this.m_PointList);
+    }
+    get StartParam()
+    {
+        return 0;
+    }
+    get EndParam()
+    {
+        return this.m_PointList.length - 1;
+    }
+    GetSnapPoints()
+    {
+        return this.m_PointList
+    }
+    GetStretchPoints()
+    {
+        return this.m_PointList;
+    }
+    MoveSnapPoints(indexList: Array<number>, vec: Vector3)
+    {
+        this.WriteAllObjectRecord();
+        for (let index of indexList)
+        {
+            this.m_PointList[index].add(vec)
+        }
+        this.Update()
+    }
+    MoveStretchPoints(indexList: Array<number>, vec: Vector3)
+    {
+        this.WriteAllObjectRecord();
+        for (let index of indexList)
+        {
+            this.m_PointList[index].add(vec)
+        }
+        this.Update()
+    }
     InitDrawObject(renderType: RenderType = RenderType.Wireframe): Object3D
     {
         let curve = new THREE.CatmullRomCurve3(this.Points);
@@ -43,4 +86,22 @@ export class Spline extends Entity
         geo.verticesNeedUpdate = true;
         geo.computeBoundingSphere();
     }
+    ReadFile(file: CADFile)
+    {
+        super.ReadFile(file);
+        let ver = file.Read();//1
+        let count = file.Read();
+        this.m_PointList = [];
+        for (let i = 0; i < count; i++)
+        {
+            this.m_PointList.push(new Vector3().fromArray(file.Read()));
+        }
+    }
+    WriteFile(file: CADFile)
+    {
+        super.WriteFile(file);
+        file.Write(1);//ver
+        file.Write(this.m_PointList.length)
+        this.m_PointList.forEach(p => file.Write(p.toArray()))
+    }
 }