diff --git a/README.md b/README.md
index 2f6f6d9..177104a 100644
--- a/README.md
+++ b/README.md
@@ -85,6 +85,8 @@ Chrome浏览器:
 
 只需含有 `DedeUserID=...;SESSDATA=...;bili_jct=...;buvid3=...` 即可
 
+buvid3亦可不填 使用随机生成值
+
 (分号分割, 不要换行, 顺序随意)
 
 ↓↓
diff --git a/lib/data/global_var.js b/lib/data/global_var.js
index 5537446..0758209 100644
--- a/lib/data/global_var.js
+++ b/lib/data/global_var.js
@@ -1,4 +1,4 @@
-const { getRemoteConfig, createDir, createFile, dyids_dir } = require("../utils");
+const { getRemoteConfig, getRandomOne, createDir, createFile, dyids_dir } = require("../utils");
 const config = require("../data/config");
 
 let global_var = {
@@ -30,7 +30,18 @@ let global_var = {
             config.updata(num);
 
             if (!/buvid3/.test(cookie)) {
-                this.set('cookie', cookie + ';buvid3=AAAAAAAA-BBBB-CCCC-DDDD-DDDDDDDDDDDDDDDDDinfoc');
+                const charset = "0123456789ABCDEF".split("");
+                const buvid3 = "x".repeat(8).split("").map(() => getRandomOne(charset)).join("")
+                    + "-"
+                    + "x".repeat(4).split("").map(() => getRandomOne(charset)).join("")
+                    + "-"
+                    + "x".repeat(4).split("").map(() => getRandomOne(charset)).join("")
+                    + "-"
+                    + "x".repeat(4).split("").map(() => getRandomOne(charset)).join("")
+                    + "-"
+                    + "x".repeat(17).split("").map(() => getRandomOne(charset)).join("")
+                    + "infoc";
+                this.set('cookie', cookie + ";" + buvid3);
             } else {
                 this.set('cookie', cookie);
             }