diff --git a/components/tree/demo/dynamic.md b/components/tree/demo/dynamic.md
index 29763d5f69..af20ce40c9 100644
--- a/components/tree/demo/dynamic.md
+++ b/components/tree/demo/dynamic.md
@@ -73,40 +73,5 @@ const Demo: React.FC<{}> = () => {
   return <Tree loadData={onLoadData} treeData={treeData} />;
 };
 
-class Demo1 extends React.Component {
-  state = {
-    treeData: [
-      { title: 'Expand to load', key: '0' },
-      { title: 'Expand to load', key: '1' },
-      { title: 'Tree Node', key: '2', isLeaf: true },
-    ],
-  };
-
-  onLoadData = treeNode => {
-    const { treeData } = this.state;
-    return new Promise(resolve => {
-      const { props } = treeNode;
-      if (treeNode.children) {
-        resolve();
-        return;
-      }
-      setTimeout(() => {
-        treeNode.children = [
-          { title: 'Child Node', key: `${treeNode.eventKey}-0` },
-          { title: 'Child Node', key: `${treeNode.eventKey}-1` },
-        ];
-        this.setState({
-          treeData: [...this.state.treeData],
-        });
-        resolve();
-      }, 1000);
-    });
-  };
-
-  render() {
-    return <Tree loadData={this.onLoadData} treeData={this.state.treeData} />;
-  }
-}
-
 ReactDOM.render(<Demo />, mountNode);
 ```