diff --git a/img/bg.jpg b/img/bg/1.jpg
similarity index 100%
rename from img/bg.jpg
rename to img/bg/1.jpg
diff --git a/img/bg/2.jpg b/img/bg/2.jpg
new file mode 100644
index 0000000..834f644
Binary files /dev/null and b/img/bg/2.jpg differ
diff --git a/script.js b/script.js
index 1115e87..448f82e 100644
--- a/script.js
+++ b/script.js
@@ -2,11 +2,19 @@ let currentLang = "zh";
 let data, i18n;
 
 document.addEventListener("DOMContentLoaded", () => {
+    setRandomBackground();
     loadData("data.json", loadBlockchainOptions);
     changeLanguage(currentLang);
     updateCopyrightYear();
 });
 
+function setRandomBackground() {
+    const images = ['1.jpg', '2.jpg'];
+    const randomIndex = Math.floor(Math.random() * images.length);
+    const selectedImage = images[randomIndex];
+    document.body.style.backgroundImage = `url('img/bg/${selectedImage}')`;
+}
+
 function updateCopyrightYear() {
     const currentYear = new Date().getFullYear();
     let copyrightText;
diff --git a/styles.css b/styles.css
index b2aa9cd..ff627d6 100644
--- a/styles.css
+++ b/styles.css
@@ -1,7 +1,6 @@
 body {
     font-family: Microsoft YaHei;
     font-weight: bold;
-    background-image: url("img/bg.jpg");
     background-size: cover;
     background-position: center;
     background-repeat: no-repeat;