diff --git a/blog.config.js b/blog.config.js
index f4c9ab67..2103e7c4 100644
--- a/blog.config.js
+++ b/blog.config.js
@@ -12,6 +12,7 @@ const BLOG = {
     homeBannerImage: './bg_image.jpg', // 背景图地址
     showPostCover: false, // 文章列表显示封面图
     showPreview: true, // 列表展示文章预览
+    previewLines: 12, // 预览文章的篇幅
     showSummary: false // 显示用户自定义摘要
   },
   lang: 'zh-CN', // ['zh-CN','en-US'] default lang => see /lib/lang.js for more.
diff --git a/pages/index.js b/pages/index.js
index 4da207d9..3b05aff4 100644
--- a/pages/index.js
+++ b/pages/index.js
@@ -28,7 +28,7 @@ export async function getStaticProps () {
     )
     for (const i in postsToShow) {
       const post = postsToShow[i]
-      const blockMap = await getPostBlocks(post.id, 'slug', 12)
+      const blockMap = await getPostBlocks(post.id, 'slug', BLOG.home.previewLines)
       if (blockMap) {
         post.blockMap = blockMap
       }
diff --git a/pages/page/[page].js b/pages/page/[page].js
index 274a283d..a91e80a2 100644
--- a/pages/page/[page].js
+++ b/pages/page/[page].js
@@ -54,7 +54,7 @@ export async function getStaticProps ({ params: { page } }) {
 
   for (const i in postsToShow) {
     const post = postsToShow[i]
-    const blockMap = await getPostBlocks(post.id, 'slug', 12)
+    const blockMap = await getPostBlocks(post.id, 'slug', BLOG.home.previewLines)
     if (blockMap) {
       post.blockMap = blockMap
     }