diff --git a/simple-mind-map/src/plugins/RichText.js b/simple-mind-map/src/plugins/RichText.js
index 2752d7fc..e96f98b9 100644
--- a/simple-mind-map/src/plugins/RichText.js
+++ b/simple-mind-map/src/plugins/RichText.js
@@ -98,6 +98,7 @@ class RichText {
 
       .smm-richtext-node-wrap p {
         font-family: auto;
+        user-select: none;
       }
       `
     )