diff --git a/application/admin/controller/Order.php b/application/admin/controller/Order.php
index d160404..e2fcc4c 100644
--- a/application/admin/controller/Order.php
+++ b/application/admin/controller/Order.php
@@ -1139,7 +1139,7 @@ class Order extends Backend
             return $result->getData()['rows'] ?? [];
         };
 
-        $this->exportExcelByStream($columns, $fetchData, '订单导出_' . date('Ymd_His') . '.xlsx');
+        $this->exportCsvByStream($columns, $fetchData, '订单导出_' . date('Ymd_His') . '.xlsx');
     }
 
 
diff --git a/application/common/controller/Backend.php b/application/common/controller/Backend.php
index 56745ff..1357357 100755
--- a/application/common/controller/Backend.php
+++ b/application/common/controller/Backend.php
@@ -5,7 +5,7 @@ namespace app\common\controller;
 use app\admin\library\Auth;
 use PhpOffice\PhpSpreadsheet\Spreadsheet;
 use PhpOffice\PhpSpreadsheet\Worksheet\Worksheet;
-use PhpOffice\PhpSpreadsheet\Writer\Xlsx;
+use PhpOffice\PhpSpreadsheet\Writer\Csv;
 use think\Config;
 use think\Controller;
 use think\Db;
@@ -766,12 +766,10 @@ class Backend extends Controller
         return $res;
     }
 
-    protected function exportExcelByStream(array $columns, callable $fetchData, string $filename = '导出.xlsx', int $limit = 1000)
+    protected function exportCsvByStream(array $columns, callable $fetchData, string $filename = '导出.csv', int $limit = 1000)
     {
         $page = 1;
         $rowIndex = 2;
-        if (ob_get_level()) ob_end_clean();
-        ob_clean();
 
         ini_set('memory_limit', '512M');
         set_time_limit(0);
@@ -786,8 +784,11 @@ class Backend extends Controller
         $spreadsheet->setActiveSheetIndex(0);
         $sheet = $spreadsheet->getActiveSheet();
 
-        $writer = new Xlsx($spreadsheet);
-        $writer->setPreCalculateFormulas(false);
+        $writer = new Csv($spreadsheet);
+        $writer->setDelimiter(','); // 可改为 \t 导出为 TSV
+        $writer->setEnclosure('"');
+        $writer->setLineEnding("\r\n");
+        $writer->setSheetIndex(0);
 
         // 获取字段映射
         $titles = array_column($columns, 'title');
@@ -818,15 +819,19 @@ class Backend extends Controller
             $page++;
         } while ($count === $limit);
 
-        // 输出为下载流
-        $filename = $filename ?: ('导出_' . date('Ymd_His') . '.xlsx');
-        header('Content-Type: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet');
+        // 输出为 CSV 下载流
+        $filename = $filename ?: ('导出_' . date('Ymd_His') . '.csv');
+
+        header('Content-Type: text/csv; charset=UTF-8');
         header('Content-Disposition: attachment;filename="' . $filename . '"');
         header('Cache-Control: max-age=0');
         header('Expires: Mon, 26 Jul 1997 05:00:00 GMT');
         header('Last-Modified: ' . gmdate('D, d M Y H:i:s') . ' GMT');
         header('Pragma: public');
 
+        // 输出 UTF-8 BOM 防止 Excel 乱码
+        echo "\xEF\xBB\xBF";
+
         $writer->save('php://output');
         $spreadsheet->disconnectWorksheets();
         unset($spreadsheet);