diff --git a/src/services/authService.ts b/src/services/authService.ts
index a6d3c91..09c02a1 100644
--- a/src/services/authService.ts
+++ b/src/services/authService.ts
@@ -141,7 +141,16 @@ export function getGitHubLoginUrl(state?: string): string {
     : '/api/v1';
 
   console.log('[Auth] Generating GitHub URL with base:', baseUrl);
-  const url = new URL(`${baseUrl}/auth/github`);
+
+  // 处理相对路径问题：URL构造函数依然需要完整的 base 才能处理相对路径
+  let fullUrlString;
+  if (baseUrl.startsWith('/')) {
+    fullUrlString = `${window.location.origin}${baseUrl}/auth/github`;
+  } else {
+    fullUrlString = `${baseUrl}/auth/github`;
+  }
+
+  const url = new URL(fullUrlString);
   if (state) {
     url.searchParams.append('state', state);
   }