diff --git a/public/preview.png b/public/preview.png
index 95278eb..133e954 100644
Binary files a/public/preview.png and b/public/preview.png differ
diff --git a/src/layouts/MarkdownPost.astro b/src/layouts/MarkdownPost.astro
index c211a25..e3c19f3 100644
--- a/src/layouts/MarkdownPost.astro
+++ b/src/layouts/MarkdownPost.astro
@@ -3,7 +3,7 @@ import BaseHead from "../components/header/BaseHead.astro"
 import Header from "../components/header/Header.astro"
 import Footer from "../components/Footer.astro"
 
-import { formatDate } from "../utils"
+import { formatDate, getCoverImage } from "../utils"
 import { SITE_TITLE } from "../consts"
 const { frontmatter } = Astro.props
 const type = frontmatter.tags?.[0] ?? "默认"
@@ -20,7 +20,7 @@ const dateFormatted = formatDate(pubDate)
       <BaseHead
         title={`${title} - ${SITE_TITLE}`}
         description={description}
-        image={frontmatter.cover?.square}
+        image={getCoverImage(frontmatter.cover)}
       />
     </head>
     <body
diff --git a/src/layouts/MoreTile.astro b/src/layouts/MoreTile.astro
index d166571..6644083 100644
--- a/src/layouts/MoreTile.astro
+++ b/src/layouts/MoreTile.astro
@@ -1,11 +1,10 @@
 ---
-import { CA_LOGO_URL } from "../consts"
-import { formatDate } from "../utils"
+import { formatDate, getCoverImage } from "../utils"
 const { title, href, cover, tags, date } = Astro.props
 const dateFormatted = formatDate(date)
 const type = tags?.[0] ?? "默认"
 
-const image = cover?.url ?? cover ?? CA_LOGO_URL
+const image = getCoverImage(cover)
 
 const label = `${title} - ${type} - 发表时间 ${dateFormatted}`;
 ---
diff --git a/src/utils.ts b/src/utils.ts
index d0e2846..beadd0b 100644
--- a/src/utils.ts
+++ b/src/utils.ts
@@ -1,3 +1,5 @@
+import { CA_LOGO_URL } from "./consts"
+
 export function formatDate(dateString: string) {
   const date = new Date(dateString)
   const year = date.getFullYear()
@@ -16,3 +18,17 @@ export function formatDateV2(date: string) {
   // 返回格式化后的日期
   return formattedDate
 }
+
+export const getCoverImage = (cover: unknown) => {
+  switch (typeof cover) {
+    case "string":
+      return cover
+    case "object":
+      if (cover && "url" in cover) {
+        return (cover as { url: string }).url
+      }
+      return CA_LOGO_URL
+    default:
+      return CA_LOGO_URL
+  }
+}
