diff --git a/simple-mind-map/src/constants/constant.js b/simple-mind-map/src/constants/constant.js
index 5e1381bf..d4903fdc 100644
--- a/simple-mind-map/src/constants/constant.js
+++ b/simple-mind-map/src/constants/constant.js
@@ -208,7 +208,7 @@ export const cssContent = `
     stroke-width: 2;
   }
 
-  .smm-text-node-wrap {
+  .smm-text-node-wrap, .smm-expand-btn-text {
     user-select: none;
   }
 `
diff --git a/simple-mind-map/src/core/render/node/nodeExpandBtn.js b/simple-mind-map/src/core/render/node/nodeExpandBtn.js
index baf26b36..65f540d4 100644
--- a/simple-mind-map/src/core/render/node/nodeExpandBtn.js
+++ b/simple-mind-map/src/core/render/node/nodeExpandBtn.js
@@ -12,6 +12,7 @@ function createExpandNodeContent() {
   if (this.mindMap.opt.isShowExpandNum) {
     // 展开的节点
     this._openExpandNode = new Text()
+    this._openExpandNode.addClass('smm-expand-btn-text')
     // 文本垂直居中
     this._openExpandNode.attr({
       'text-anchor': 'middle',