diff --git a/lib/plugins/helper/search_form.js b/lib/plugins/helper/search_form.js
index f2ed726eb5..a0ce916d5f 100644
--- a/lib/plugins/helper/search_form.js
+++ b/lib/plugins/helper/search_form.js
@@ -12,7 +12,7 @@ function searchFormHelper(options){
   return '<form action="//google.com/search" method="get" accept-charset="UTF-8" class="' + className + '">' +
     '<input type="search" name="q" results="0" class="' + className + '-input"' + (text ? ' placeholder="' + text + '"' : '') + '>' +
     (button ? '<button type="submit" class="' + className + '-submit">' + (typeof button === 'string' ? button : text) + '</button>' : '') +
-    '<input type="hidden" name="q" value="site:' + config.url + '">' +
+    '<input type="hidden" name="sitesearch" value="' + config.url + '">' +
     '</form>';
 }
 
diff --git a/test/scripts/helpers/search_form.js b/test/scripts/helpers/search_form.js
index 0d1ef26f6f..1e22a31aa0 100644
--- a/test/scripts/helpers/search_form.js
+++ b/test/scripts/helpers/search_form.js
@@ -10,21 +10,21 @@ describe('search_form', function(){
   it('default', function(){
     searchForm().should.eql('<form action="//google.com/search" method="get" accept-charset="UTF-8" class="search-form">' +
       '<input type="search" name="q" results="0" class="search-form-input" placeholder="Search">' +
-      '<input type="hidden" name="q" value="site:http://hexo.io">' +
+      '<input type="hidden" name="sitesearch" value="http://hexo.io">' +
       '</form>');
   });
 
   it('class', function(){
     searchForm({class: 'foo'}).should.eql('<form action="//google.com/search" method="get" accept-charset="UTF-8" class="foo">' +
       '<input type="search" name="q" results="0" class="foo-input" placeholder="Search">' +
-      '<input type="hidden" name="q" value="site:http://hexo.io">' +
+      '<input type="hidden" name="sitesearch" value="http://hexo.io">' +
       '</form>');
   });
 
   it('text', function(){
     searchForm({text: 'Find'}).should.eql('<form action="//google.com/search" method="get" accept-charset="UTF-8" class="search-form">' +
       '<input type="search" name="q" results="0" class="search-form-input" placeholder="Find">' +
-      '<input type="hidden" name="q" value="site:http://hexo.io">' +
+      '<input type="hidden" name="sitesearch" value="http://hexo.io">' +
       '</form>');
   });
 
@@ -32,7 +32,7 @@ describe('search_form', function(){
     searchForm({button: true, text: 'Find'}).should.eql('<form action="//google.com/search" method="get" accept-charset="UTF-8" class="search-form">' +
       '<input type="search" name="q" results="0" class="search-form-input" placeholder="Find">' +
       '<button type="submit" class="search-form-submit">Find</button>' +
-      '<input type="hidden" name="q" value="site:http://hexo.io">' +
+      '<input type="hidden" name="sitesearch" value="http://hexo.io">' +
       '</form>');
   });
 
@@ -40,7 +40,7 @@ describe('search_form', function(){
     searchForm({button: 'Go', text: 'Find'}).should.eql('<form action="//google.com/search" method="get" accept-charset="UTF-8" class="search-form">' +
       '<input type="search" name="q" results="0" class="search-form-input" placeholder="Find">' +
       '<button type="submit" class="search-form-submit">Go</button>' +
-      '<input type="hidden" name="q" value="site:http://hexo.io">' +
+      '<input type="hidden" name="sitesearch" value="http://hexo.io">' +
       '</form>');
   });
 });
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