diff --git a/core/core.php b/core/core.php
index a100512..3e407b8 100644
--- a/core/core.php
+++ b/core/core.php
@@ -70,10 +70,12 @@ function themeInit($self)
         };
     }
 
-    /* 增加自定义sitemap功能 */
-    if ($self->request->getRequestUri() == "/sitemap.xml" || $self->request->getRequestUri() == "/index.php/sitemap.xml") {
-        $self->setThemeFile("library/sitemap.php");
-        $self->response->setStatus(200);
+    /* 增加自定义SiteMap功能 */
+    if (Helper::options()->JSiteMap && Helper::options()->JSiteMap !== 'off') {
+        if ($self->request->getRequestUri() == "/sitemap.xml" || $self->request->getRequestUri() == "/index.php/sitemap.xml") {
+            $self->setThemeFile("library/sitemap.php");
+            $self->response->setStatus(200);
+        }
     }
 }
 
diff --git a/core/function.php b/core/function.php
index e106bf5..78cd678 100644
--- a/core/function.php
+++ b/core/function.php
@@ -3,7 +3,7 @@
 /* 获取主题当前版本号 */
 function _getVersion()
 {
-	return "5.5.9";
+	return "5.6.0";
 };
 
 /* 判断是否是手机 */
diff --git a/functions.php b/functions.php
index bb11b42..8976c16 100644
--- a/functions.php
+++ b/functions.php
@@ -851,6 +851,34 @@ function themeConfig($form)
     $JPasteUpload->setAttribute('class', 'joe_content joe_other');
     $form->addInput($JPasteUpload->multiMode());
 
+    $JSiteMap = new Typecho_Widget_Helper_Form_Element_Select(
+        'JSiteMap',
+        array(
+            'off' => '关闭（默认）',
+            '100' => '显示最新 100 条链接',
+            '200' => '显示最新 200 条链接',
+            '300' => '显示最新 300 条链接',
+            '400' => '显示最新 400 条链接',
+            '500' => '显示最新 500 条链接',
+            '600' => '显示最新 600 条链接',
+            '700' => '显示最新 700 条链接',
+            '800' => '显示最新 800 条链接',
+            '900' => '显示最新 900 条链接',
+            '1000' => '显示最新 1000 条链接',
+        ),
+        'off',
+        '是否开启主题自带SiteMap功能',
+        '介绍：开启后博客将享有SiteMap功能 <br />
+         其他：链接为博客最新实时链接 <br />
+         好处：无需手动生成，无需频繁提交，提交一次即可 <br />
+         开启后SiteMap访问地址：<br />
+         http(s)://域名/sitemap.xml （开启了伪静态）<br />  
+         http(s)://域名/index.php/sitemap.xml （未开启伪静态）
+         '
+    );
+    $JSiteMap->setAttribute('class', 'joe_content joe_other');
+    $form->addInput($JSiteMap->multiMode());
+
     $JBaiduToken = new Typecho_Widget_Helper_Form_Element_Text(
         'JBaiduToken',
         NULL,
diff --git a/library/sitemap.php b/library/sitemap.php
index f810ffe..3e20d74 100644
--- a/library/sitemap.php
+++ b/library/sitemap.php
@@ -1,16 +1,24 @@
 <?php
+
 $db = Typecho_Db::get();
 $options = Typecho_Widget::widget('Widget_Options');
-$pages = $db->fetchAll($db->select()->from('table.contents')
-    ->where('table.contents.status = ?', 'publish')
-    ->where('table.contents.created < ?', $options->gmtTime)
-    ->where('table.contents.type = ?', 'page')
-    ->order('table.contents.created', Typecho_Db::SORT_DESC));
-$articles = $db->fetchAll($db->select()->from('table.contents')
-    ->where('table.contents.status = ?', 'publish')
-    ->where('table.contents.created < ?', $options->gmtTime)
-    ->where('table.contents.type = ?', 'post')
-    ->order('table.contents.created', Typecho_Db::SORT_DESC));
+$limit = Helper::options()->JSiteMap;
+$pages = $db->fetchAll(
+    $db->select()->from('table.contents')
+        ->where('table.contents.status = ?', 'publish')
+        ->where('table.contents.created < ?', $options->gmtTime)
+        ->where('table.contents.type = ?', 'page')
+        ->limit($limit)
+        ->order('table.contents.created', Typecho_Db::SORT_DESC)
+);
+$articles = $db->fetchAll(
+    $db->select()->from('table.contents')
+        ->where('table.contents.status = ?', 'publish')
+        ->where('table.contents.created < ?', $options->gmtTime)
+        ->where('table.contents.type = ?', 'post')
+        ->limit($limit)
+        ->order('table.contents.created', Typecho_Db::SORT_DESC)
+);
 header("Content-Type: application/xml");
 echo "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n";
 echo "<urlset xmlns=\"http://www.sitemaps.org/schemas/sitemap/0.9\">\n";
@@ -22,7 +30,7 @@ foreach ($pages as $page) {
     echo "\t<url>\n";
     echo "\t\t<loc>" . $page['permalink'] . "</loc>\n";
     echo "\t\t<lastmod>" . date('Y-m-d\TH:i:s\Z', $page['modified']) . "</lastmod>\n";
-    echo "\t\t<changefreq>always</changefreq>\n";
+    echo "\t\t<changefreq>monthly</changefreq>\n";
     echo "\t\t<priority>0.8</priority>\n";
     echo "\t</url>\n";
 }
@@ -45,7 +53,7 @@ foreach ($articles as $article) {
     echo "\t<url>\n";
     echo "\t\t<loc>" . $article['permalink'] . "</loc>\n";
     echo "\t\t<lastmod>" . date('Y-m-d\TH:i:s\Z', $article['modified']) . "</lastmod>\n";
-    echo "\t\t<changefreq>always</changefreq>\n";
+    echo "\t\t<changefreq>monthly</changefreq>\n";
     echo "\t\t<priority>0.5</priority>\n";
     echo "\t</url>\n";
 }