diff --git a/Application/Admin/Controller/ExportController.class.php b/Application/Admin/Controller/ExportController.class.php
index dadd68150..8205764a9 100644
--- a/Application/Admin/Controller/ExportController.class.php
+++ b/Application/Admin/Controller/ExportController.class.php
@@ -3083,7 +3083,7 @@ class ExportController extends Controller
                 $item['promote_name'] = $promoteName;
                 foreach ($dayList as $day) {
                     if ($item['register_count'] > 0) {
-                        $item['retention_day'. $day] = round($item['retention_day'. $day]/$item['register_count'], 4)*100;
+                        $item['retention_day'. $day] = (round($item['retention_day'. $day]/$item['register_count'], 4)*100) . '%';
                     } else {
                         $item['retention_day'. $day] = '--';
                     }