diff --git a/src/core/global-api.js b/src/core/global-api.js
index aa2ae0ee5..b5565d9cb 100644
--- a/src/core/global-api.js
+++ b/src/core/global-api.js
@@ -2,12 +2,13 @@ import * as util from './util'
 import * as dom from './util/dom'
 import * as render from './render/compiler'
 import * as route from './route/hash'
+import { slugify } from './render/slugify'
 import { get } from './fetch/ajax'
 import marked from 'marked'
 import prism from 'prismjs'
 
 export default function () {
-  window.Docsify = { util, dom, render, route, get }
+  window.Docsify = { util, dom, render, route, get, slugify }
   window.marked = marked
   window.Prism = prism
 }
diff --git a/src/core/render/compiler.js b/src/core/render/compiler.js
index 58db9b3a8..785f70c35 100644
--- a/src/core/render/compiler.js
+++ b/src/core/render/compiler.js
@@ -2,7 +2,7 @@ import marked from 'marked'
 import Prism from 'prismjs'
 import { helper as helperTpl, tree as treeTpl } from './tpl'
 import { genTree } from './gen-tree'
-import { slugify, clearSlugCache } from './slugify'
+import { slugify } from './slugify'
 import { emojify } from './emojify'
 import { toURL, parse } from '../route/hash'
 import { getBasePath, isAbsolutePath, getPath } from '../route/util'
@@ -25,7 +25,7 @@ export const markdown = cached(text => {
 
   html = markdownCompiler(text)
   html = emojify(html)
-  clearSlugCache()
+  slugify.clear()
 
   return html
 })
diff --git a/src/core/render/slugify.js b/src/core/render/slugify.js
index a6e9d39b9..bb34758a1 100644
--- a/src/core/render/slugify.js
+++ b/src/core/render/slugify.js
@@ -22,6 +22,6 @@ export function slugify (str) {
   return slug
 }
 
-export function clearSlugCache () {
+slugify.clear = function () {
   cache = {}
 }
diff --git a/src/plugins/search/component.js b/src/plugins/search/component.js
index cc7d0ec08..524448c8e 100644
--- a/src/plugins/search/component.js
+++ b/src/plugins/search/component.js
@@ -107,7 +107,7 @@ function bindEvents () {
     e => e.target.tagName !== 'A' && e.stopPropagation())
   dom.on($input, 'input', e => {
     clearTimeout(timeId)
-    timeId = setTimeout(_ => doSearch(e.target.value.trim()), 200)
+    timeId = setTimeout(_ => doSearch(e.target.value.trim()), 100)
   })
 }
 
diff --git a/src/plugins/search/search.js b/src/plugins/search/search.js
index 58e8cbf3e..9888d63a9 100644
--- a/src/plugins/search/search.js
+++ b/src/plugins/search/search.js
@@ -40,13 +40,14 @@ function saveData (maxAge) {
 
 export function genIndex (path, content = '') {
   const tokens = window.marked.lexer(content)
+  const slugify = window.Docsify.slugify
   const toURL = Docsify.route.toURL
   const index = {}
   let slug
 
   tokens.forEach(token => {
     if (token.type === 'heading' && token.depth <= 2) {
-      slug = toURL(path, { id: token.text })
+      slug = toURL(path, { id: slugify(token.text) })
       index[slug] = { slug, title: token.text, body: '' }
     } else {
       if (!slug) return
@@ -61,7 +62,7 @@ export function genIndex (path, content = '') {
       }
     }
   })
-
+  slugify.clear()
   return index
 }