diff --git a/scripts/helpers/doc_tree.js b/scripts/helpers/doc_tree.js
deleted file mode 100644
index b40df65..0000000
--- a/scripts/helpers/doc_tree.js
+++ /dev/null
@@ -1,48 +0,0 @@
-/**
- * doc_tree(page, {toc: false})
- */
-
-'use strict';
-
-var util = require('hexo-util');
-
-hexo.extend.helper.register('doc_tree', function(page, args){
-  if (page.layout != 'wiki') {
-    return '';
-  }
-  const pages = hexo.locals.get('pages').filter(function (p) {
-    if (p.layout == 'wiki' && p.wiki && p.wiki == page.wiki) {
-      return true;
-    } else {
-      return false;
-    }
-  }).sort('order');
-  if (pages.length == 0) {
-    return '';
-  }
-  var el = '';
-  el += '<div class="doc-tree">';
-  function doc_node(p) {
-    if ((p.title || p.seo_title) && p.permalink) {
-      var node = '<div class="doc-node">';
-      node += '<a class="doc-tree-link';
-      if (p.permalink == page.permalink) {
-        node += ' active';
-      }
-      node += '" href="' + p.permalink + '">';
-      node += '<span class="toc-text">';
-      node += p.title || p.seo_title;
-      node += '</span>';
-      node += '</a>';
-      node += '</div>';
-      return node;
-    } else {
-      return '';
-    }
-  }
-  pages.forEach((p, i) => {
-    el += doc_node(p);
-  });
-  el += '</div>';
-  return el;
-});