diff --git a/frontend/admin-web/src/app/(dashboard)/contracts/page.tsx b/frontend/admin-web/src/app/(dashboard)/contracts/page.tsx
index 0cfc4488..0636ba32 100644
--- a/frontend/admin-web/src/app/(dashboard)/contracts/page.tsx
+++ b/frontend/admin-web/src/app/(dashboard)/contracts/page.tsx
@@ -196,14 +196,14 @@ export default function ContractsPage() {
         }
 
         const reader = response.body.getReader();
-        const chunks: Uint8Array[] = [];
+        const chunks: ArrayBuffer[] = [];
         let loaded = 0;
 
         while (true) {
           const { done, value } = await reader.read();
           if (done) break;
 
-          chunks.push(value);
+          chunks.push(value.buffer as ArrayBuffer);
           loaded += value.length;
 
           if (total > 0) {
@@ -213,7 +213,7 @@ export default function ContractsPage() {
         }
 
         // 合并所有 chunks 为 Blob
-        const blob = new Blob(chunks);
+        const blob = new Blob(chunks, { type: 'application/zip' });
 
         // 写入文件
         const writable = await fileHandle.createWritable();