diff --git a/assets/img/background.jpg b/assets/img/background.jpg
new file mode 100644
index 0000000..6ff4ed2
Binary files /dev/null and b/assets/img/background.jpg differ
diff --git a/assets/img/background.png b/assets/img/background.png
deleted file mode 100644
index 298940d..0000000
Binary files a/assets/img/background.png and /dev/null differ
diff --git a/header.php b/header.php
index 60ae8f6..34afd19 100644
--- a/header.php
+++ b/header.php
@@ -66,13 +66,7 @@
         <?php if (kratos_option('top_img_switch', true)) { ?>
             <div class="banner">
                 <div class="overlay"></div>
-                <div class="content text-center" style="background-image: url(<?php
-                                                                                if (!kratos_option('top_img')) {
-                                                                                    $img = ASSET_PATH . '/assets/img/background.png';
-                                                                                } else {
-                                                                                    $img = kratos_option('top_img', ASSET_PATH . '/assets/img/background.png');
-                                                                                }
-                                                                                echo $img; ?>);">
+                <div class="content text-center" style="background-image: url(<?php echo kratos_option('top_img', ASSET_PATH . '/assets/img/background.jpg'); ?>);">
                     <div class="introduce animate__animated animate__fadeInUp">
                         <?php
                         if (is_category() || is_tag()) {
diff --git a/inc/theme-options.php b/inc/theme-options.php
index 3847c10..3844760 100644
--- a/inc/theme-options.php
+++ b/inc/theme-options.php
@@ -813,7 +813,7 @@ CSF::createSection($prefix, array(
             'title' =>  __('顶部图片', 'kratos'),
             'library' => 'image',
             'preview' => true,
-            'default' => get_template_directory_uri() . '/assets/img/background.png',
+            'default' => get_template_directory_uri() . '/assets/img/background.jpg',
         ),
         array(
             'id' => 'top_title',