fix: .

src/graphic/Controls/MovePoint.js

@@ -71,7 +71,8 @@ export default class MovePoint {
           let startPoint = dataService.getPoint(line.startId);
           let endPoint = dataService.getPoint(line.endId);
           if (
-            mathUtil.getDistance(startPoint, endPoint) == 0 
+            mathUtil.getDistance(startPoint, endPoint) == 0 && 
+            startPoint.category != VectorCategory.Point.BasePoint //点重叠不应删除基准点
           ) {
             pointService.deletePoint(pointId);
           }