diff --git a/simple-mind-map/src/Node.js b/simple-mind-map/src/Node.js
index 117fc6c2..d00867a3 100644
--- a/simple-mind-map/src/Node.js
+++ b/simple-mind-map/src/Node.js
@@ -990,6 +990,7 @@ class Node {
      * @Desc: 创建或更新展开收缩按钮内容 
      */
     updateExpandBtnNode() {
+        if (this.children.length === 0) return
         if (this._expandBtn) {
             this._expandBtn.clear()
         }