diff --git a/simple-mind-map/src/core/render/Render.js b/simple-mind-map/src/core/render/Render.js
index 6b873284..5e180d3c 100644
--- a/simple-mind-map/src/core/render/Render.js
+++ b/simple-mind-map/src/core/render/Render.js
@@ -1553,7 +1553,7 @@ class Render {
   //  切换激活节点的展开状态
   toggleActiveExpand() {
     this.activeNodeList.forEach(node => {
-      if (node.nodeData.children.length <= 0) {
+      if (node.nodeData.children.length <= 0 || node.isRoot) {
         return
       }
       this.toggleNodeExpand(node)