diff --git a/package.json b/package.json
index 351796b..e84ecd8 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@vesoft-inc/veditor",
-  "version": "4.4.3-beta.3",
+  "version": "4.4.5",
   "description": "svg flow editor",
   "main": "./dist/VEditor.js",
   "types": "./types/index.d.ts",
diff --git a/src/Shape/Lines/PolyLine.ts b/src/Shape/Lines/PolyLine.ts
index 0abfba1..206c03e 100644
--- a/src/Shape/Lines/PolyLine.ts
+++ b/src/Shape/Lines/PolyLine.ts
@@ -11,6 +11,7 @@ const PolyLine: LineRender = {
   ...Line,
   startSpace: 1,
   arcRadius: 5,
+  lineDistance: 50,
   makePath(
     from: InstanceNodePoint,
     to: InstanceNodePoint,
@@ -26,16 +27,17 @@ const PolyLine: LineRender = {
     start.y += startSpace * Math.sin(startAngle);
     end.x += endSpace * Math.cos(endAngle);
     end.y += endSpace * Math.sin(endAngle);
-    const disX = end.x - start.x;
-    const disY = end.y - start.y;
-
+    const disX = Math.abs(end.x - start.x);
+    const disY = Math.abs(end.y - start.y);
+    const lineDistanceY = this.lineDistance || (disY * .5);
+    const lineDistanceX = this.lineDistance || (disX * .5);
     const paths: any = [{
-      x: start.x + disX * .5 * Math.cos(startAngle) * (disX > 0 ? 1 : -1),
-      y: start.y + disY * .5 * Math.sin(startAngle),
+      x: start.x + lineDistanceX * Math.cos(startAngle) * (disX > 0 ? 1 : -1),
+      y: start.y + lineDistanceY * Math.sin(startAngle),
       type: "L"
     }, {
-      x: end.x + disX * .5 * Math.cos(endAngle) * (disX > 0 ? 1 : -1),
-      y: end.y + disY * .5 * Math.sin(endAngle),
+      x: end.x + (disX - lineDistanceX) * Math.cos(endAngle) * (disX > 0 ? 1 : -1),
+      y: end.y + (disY - lineDistanceY) * Math.sin(endAngle),
       type: "L"
     }];
 
diff --git a/src/Utils/Controller.ts b/src/Utils/Controller.ts
index 90bc93f..eaccf9c 100644
--- a/src/Utils/Controller.ts
+++ b/src/Utils/Controller.ts
@@ -17,6 +17,7 @@ class Controller extends Utils.Event {
   achors: number[] = [];
   status: string;
   startPosition: { x: any; y: any };
+  disableScroll: boolean = false;
   constructor(editor: VEditor) {
     super();
     this.editor = editor;
@@ -113,15 +114,16 @@ class Controller extends Utils.Event {
     if (this.status === "disabled") {
       return;
     }
-    e.preventDefault();
 
     if (e.ctrlKey) {
       // 双指
       const newScale = Math.max(1 - e.deltaY * this.scaleRatio, 0.1);
       this.zoom(newScale, e.offsetX, e.offsetY);
     } else {
+      if (this.disableScroll) return;
       this.pan(-e.deltaX, -e.deltaY);
     }
+    e.preventDefault();
   };
 
   panStart = (ev: MouseEvent) => {