diff --git a/src/drawApp/commonApp.ts b/src/drawApp/commonApp.ts
index e8f12a8..5900b58 100644
--- a/src/drawApp/commonApp.ts
+++ b/src/drawApp/commonApp.ts
@@ -7,7 +7,7 @@ import {
   ContextMenu,
   MenuItemOptions,
   KeyListener,
-  distance2,
+  calculateDistanceFromPointToLine,
   getRectangleCenter,
 } from 'jl-graphic';
 import { TrainState } from './graphics/TrainInteraction';
@@ -277,28 +277,25 @@ export function initCommonDrawApp(app: IDrawApp) {
       },
       moveLimitOption: {
         moveLimitName: 'sectionPointLimit',
-        moveLimit: () => {
+        moveLimit: (e) => {
+          const mousePos = app.toCanvasCoordinates(e.global);
           const selectSection = app.selectedGraphics[0] as Section;
           const selectSectionPos = selectSection.localToCanvasPoint(
             getRectangleCenter(selectSection.lineGraphic.getLocalBounds())
           );
-          const copySection = graphicCopyPlugin.copys[0] as Section;
-          const copySectionPos = copySection.localToCanvasPoint(
-            getRectangleCenter(copySection.lineGraphic.getLocalBounds())
-          );
+          const selectSectionLengthBound =
+            selectSection.lineGraphic.getLocalBounds();
           const sections = app.queryStore.queryByType<Section>(Section.Type);
           const minDistanceSection = sections.reduce((prev, cur) => {
-            return distance2(
-              prev.localToCanvasPoint(
-                getRectangleCenter(prev.lineGraphic.getLocalBounds())
-              ),
-              copySectionPos
+            return calculateDistanceFromPointToLine(
+              prev.localToCanvasPoint(prev.getStartPoint()),
+              prev.localToCanvasPoint(prev.getEndPoint()),
+              mousePos
             ) >
-              distance2(
-                cur.localToCanvasPoint(
-                  getRectangleCenter(cur.lineGraphic.getLocalBounds())
-                ),
-                copySectionPos
+              calculateDistanceFromPointToLine(
+                cur.localToCanvasPoint(cur.getStartPoint()),
+                cur.localToCanvasPoint(cur.getEndPoint()),
+                mousePos
               )
               ? cur
               : prev;
@@ -309,22 +306,31 @@ export function initCommonDrawApp(app: IDrawApp) {
                 minDistanceSection.lineGraphic.getLocalBounds()
               )
             );
-          const minDistanceSectionLength = distance2(
-            minDistanceSection.datas.points[0],
-            minDistanceSection.datas.points[
-              minDistanceSection.datas.points.length - 1
-            ]
-          );
-          if (copySectionPos.x > minDistanceRefSectionsPos.x) {
+          const minDistanceSectionBound =
+            minDistanceSection.lineGraphic.getLocalBounds();
+          // const changePoints = minDistanceSection.localToCanvasPoints(
+          //   ...minDistanceSection.datas.points
+          // );
+          // const minDistanceSectionLeftPoint = changePoints.reduce(
+          //   (leftmostPoint, currentPoint) => {
+          //     return currentPoint.x < leftmostPoint.x
+          //       ? currentPoint
+          //       : leftmostPoint;
+          //   },
+          //   changePoints[0]
+          // );
+          if (mousePos.x > minDistanceRefSectionsPos.x) {
             graphicCopyPlugin.container.position.x =
               minDistanceRefSectionsPos.x -
               selectSectionPos.x +
-              minDistanceSectionLength;
+              (minDistanceSectionBound.width + selectSectionLengthBound.width) /
+                2;
           } else {
             graphicCopyPlugin.container.position.x =
               minDistanceRefSectionsPos.x -
               selectSectionPos.x -
-              minDistanceSectionLength;
+              (minDistanceSectionBound.width + selectSectionLengthBound.width) /
+                2;
           }
           graphicCopyPlugin.container.position.y =
             minDistanceRefSectionsPos.y - selectSectionPos.y;