diff --git a/simple-mind-map/src/plugins/associativeLine/associativeLineControls.js b/simple-mind-map/src/plugins/associativeLine/associativeLineControls.js
index ec550100..c1b52756 100644
--- a/simple-mind-map/src/plugins/associativeLine/associativeLineControls.js
+++ b/simple-mind-map/src/plugins/associativeLine/associativeLineControls.js
@@ -38,6 +38,7 @@ function createOneControlNode(pointKey) {
 // 控制点的鼠标按下事件
 function onControlPointMousedown(e, pointKey) {
   e.stopPropagation()
+  e.preventDefault()
   this.isControlPointMousedown = true
   this.mousedownControlPointKey = pointKey
 }