diff --git a/src/app/api/auth/q58/route.ts b/src/app/api/auth/q58/route.ts
index 2901cdf..2bd2a10 100644
--- a/src/app/api/auth/q58/route.ts
+++ b/src/app/api/auth/q58/route.ts
@@ -14,7 +14,6 @@ export async function POST(req: Request) {
     const nonce = WordArray.random(16).toString();
     let return_url = `${hostUrl}/authorize`;
 
-    // 尝试从请求中获取 return_url
     try {
       const body = await req.json();
       if (body.return_url) {
diff --git a/src/components/auth/user-auth-form.tsx b/src/components/auth/user-auth-form.tsx
index 3df35c1..103894c 100644
--- a/src/components/auth/user-auth-form.tsx
+++ b/src/components/auth/user-auth-form.tsx
@@ -25,9 +25,11 @@ export function UserAuthForm({
     try {
       const body: Record<string, any> = {};
       const callbackUrl = searchParams?.get("callbackUrl");
-      if (callbackUrl) {
-        const decodedUrl = decodeURIComponent(callbackUrl);
-        body.return_url = decodedUrl;
+
+      // 如果是 OAuth 回调，则提取原始的 /oauth/authorize 部分
+      if (callbackUrl?.includes("/oauth/authorize")) {
+        const url = new URL(callbackUrl);
+        body.return_url = `${window.location.origin}${url.pathname}${url.search}`;
       }
 
       const response = await fetch("/api/auth/q58", {