diff --git a/CHANGELOG.md b/CHANGELOG.md
index f5f28c4..9f4d176 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 1.4.1
+### Bug fixes
+- Fix generate slug.
+
 ## 1.4.0 Happly new year 🎉
 ### Features
 - Display TOC in the custom sidebar, `data-sub-max-level`.
diff --git a/src/render.js b/src/render.js
index 75bed94..d6f33f5 100644
--- a/src/render.js
+++ b/src/render.js
@@ -2,7 +2,7 @@ import marked from 'marked'
 import Prism from 'prismjs'
 import * as tpl from './tpl'
 import { activeLink, scrollActiveSidebar, bindToggle, scroll2Top, sticky } from './event'
-import { genTree, getRoute, isMobile } from './util'
+import { genTree, getRoute, isMobile, slugify } from './util'
 
 let OPTIONS = {}
 const CACHE = {}
@@ -21,9 +21,7 @@ const renderer = new marked.Renderer()
  * @link https://github.com/chjj/marked#overriding-renderer-methods
  */
 renderer.heading = function (text, level) {
-  const slug = text.toLowerCase()
-      .replace(/<(?:.|\n)*?>/gm, '')
-      .replace(/[^\w|\u4e00-\u9fa5]+/g, '-')
+  const slug = slugify(text)
   let route = ''
 
   if (OPTIONS.router) {
diff --git a/src/util.js b/src/util.js
index 5471518..c5e381b 100644
--- a/src/util.js
+++ b/src/util.js
@@ -105,3 +105,32 @@ export function getRoute () {
 export function isMobile () {
   return document.body.clientWidth <= 600
 }
+
+export function slugify (string) {
+  const re = /[\u2000-\u206F\u2E00-\u2E7F\\'!"#$%&()*+,.\/:;<=>?@\[\]^`{|}~]/g
+  const maintainCase = false
+  const replacement = '-'
+  slugify.occurrences = slugify.occurrences || {}
+
+  if (typeof string !== 'string') return ''
+  if (!maintainCase) string = string.toLowerCase()
+
+  let slug = string.trim()
+    .replace(re, '')
+    .replace(/\s/g, replacement)
+  let occurrences = slugify.occurrences[slug]
+
+  if (slugify.occurrences.hasOwnProperty(slug)) {
+    occurrences++
+  } else {
+    occurrences = 0
+  }
+
+  slugify.occurrences[slug] = occurrences
+
+  if (occurrences) {
+    slug = slug + '-' + occurrences
+  }
+
+  return slug
+}