diff --git a/docs/plugins.md b/docs/plugins.md
index 34614a120..3706b897a 100644
--- a/docs/plugins.md
+++ b/docs/plugins.md
@@ -40,6 +40,10 @@ By default, the hyperlink on the current page is recognized and the content is s
       depth: 2,
 
       hideOtherSidebarContent: false, // whether or not to hide other sidebar content
+
+      // To avoid search index collision
+      // between multiple websites under the same domain
+      namespace: 'website-1',
     }
   }
 </script>
diff --git a/src/plugins/search/index.js b/src/plugins/search/index.js
index d1409a4d8..bbd3af6f0 100644
--- a/src/plugins/search/index.js
+++ b/src/plugins/search/index.js
@@ -7,7 +7,8 @@ const CONFIG = {
   paths: 'auto',
   depth: 2,
   maxAge: 86400000, // 1 day
-  hideOtherSidebarContent: false
+  hideOtherSidebarContent: false,
+  namespace: undefined
 }
 
 const install = function (hook, vm) {
@@ -23,6 +24,7 @@ const install = function (hook, vm) {
     CONFIG.noData = opts.noData || CONFIG.noData
     CONFIG.depth = opts.depth || CONFIG.depth
     CONFIG.hideOtherSidebarContent = opts.hideOtherSidebarContent || CONFIG.hideOtherSidebarContent
+    CONFIG.namespace = opts.namespace || CONFIG.namespace
   }
 
   const isAuto = CONFIG.paths === 'auto'
diff --git a/src/plugins/search/search.js b/src/plugins/search/search.js
index 1f246ed36..4f14ecd78 100644
--- a/src/plugins/search/search.js
+++ b/src/plugins/search/search.js
@@ -1,5 +1,17 @@
 let INDEXS = {}
 
+const LOCAL_STORAGE = {
+  EXPIRE_KEY: 'docsify.search.expires',
+  INDEX_KEY: 'docsify.search.index'
+}
+
+function resolveExpireKey(namespace) {
+  return namespace ? `${LOCAL_STORAGE.EXPIRE_KEY}/${namespace}` : LOCAL_STORAGE.EXPIRE_KEY
+}
+function resolveIndexKey(namespace) {
+  return namespace ? `${LOCAL_STORAGE.INDEX_KEY}/${namespace}` : LOCAL_STORAGE.INDEX_KEY
+}
+
 function escapeHtml(string) {
   const entityMap = {
     '&': '&amp;',
@@ -33,9 +45,9 @@ function getAllPaths(router) {
   return paths
 }
 
-function saveData(maxAge) {
-  localStorage.setItem('docsify.search.expires', Date.now() + maxAge)
-  localStorage.setItem('docsify.search.index', JSON.stringify(INDEXS))
+function saveData(maxAge, expireKey, indexKey) {
+  localStorage.setItem(expireKey, Date.now() + maxAge)
+  localStorage.setItem(indexKey, JSON.stringify(INDEXS))
 }
 
 export function genIndex(path, content = '', router, depth) {
@@ -149,9 +161,13 @@ export function search(query) {
 
 export function init(config, vm) {
   const isAuto = config.paths === 'auto'
-  const isExpired = localStorage.getItem('docsify.search.expires') < Date.now()
 
-  INDEXS = JSON.parse(localStorage.getItem('docsify.search.index'))
+  const expireKey = resolveExpireKey(config.namespace)
+  const indexKey = resolveIndexKey(config.namespace)
+
+  const isExpired = localStorage.getItem(expireKey) < Date.now()
+
+  INDEXS = JSON.parse(localStorage.getItem(indexKey))
 
   if (isExpired) {
     INDEXS = {}
@@ -172,7 +188,7 @@ export function init(config, vm) {
       .get(vm.router.getFile(path), false, vm.config.requestHeaders)
       .then(result => {
         INDEXS[path] = genIndex(path, result, vm.router, config.depth)
-        len === ++count && saveData(config.maxAge)
+        len === ++count && saveData(config.maxAge, expireKey, indexKey)
       })
   })
 }