diff --git a/src/graphics/slope/Slope.ts b/src/graphics/slope/Slope.ts
index 624106e..74f6f31 100644
--- a/src/graphics/slope/Slope.ts
+++ b/src/graphics/slope/Slope.ts
@@ -30,6 +30,7 @@ export class Slope extends JlGraphic {
   lineGraphic: Graphics;
   slopeNumber: VectorText;
   slopeLong: VectorText;
+  changePoints: IPointData[] = [];
   constructor() {
     super(Slope.Type);
     this.lineGraphic = new Graphics();
@@ -69,8 +70,10 @@ export class Slope extends JlGraphic {
     this.datas.points.forEach((p, i) => {
       if (i !== 0) {
         this.lineGraphic.lineTo(p.x, p.y + distanceY);
+        this.changePoints.push({ x: p.x, y: p.y + distanceY });
       } else {
         this.lineGraphic.moveTo(p.x, p.y - distanceY);
+        this.changePoints.push({ x: p.x, y: p.y - distanceY });
       }
     });
     //坡度值
diff --git a/src/graphics/slope/SlopeAssistant.ts b/src/graphics/slope/SlopeAssistant.ts
index a2199aa..519ceed 100644
--- a/src/graphics/slope/SlopeAssistant.ts
+++ b/src/graphics/slope/SlopeAssistant.ts
@@ -110,14 +110,11 @@ class SlopeGraphicHitArea implements IHitArea {
     this.slope = slope;
   }
   contains(x: number, y: number): boolean {
-    for (let i = 1; i < this.slope.datas.points.length; i++) {
-      const p1 = this.slope.datas.points[i - 1];
-      const p2 = this.slope.datas.points[i];
-      if (linePoint(p1, p2, { x, y }, SlopeConsts.lineWidth)) {
-        return true;
-      }
-    }
-    return false;
+    let contains = false;
+    const p1 = this.slope.changePoints[0];
+    const p2 = this.slope.changePoints[1];
+    contains = contains || linePoint(p1, p2, { x, y }, SlopeConsts.lineWidth);
+    return contains;
   }
 }