diff --git a/webapp/services/RoomBattleDataService.php b/webapp/services/RoomBattleDataService.php
index b2e28232..f468c585 100644
--- a/webapp/services/RoomBattleDataService.php
+++ b/webapp/services/RoomBattleDataService.php
@@ -335,10 +335,12 @@ class RoomBattleDataService extends BaseService {
         $rate = isset($chestLootProbArr[$teamRank-1]) ? $chestLootProbArr[$teamRank-1] : 0;
         if ($rate > 0 && !empty($member['box_num']) && myself()->_switchIsOpen('bigEventBoxDrop')){
             $rewardBox = array();
+            $realBoxNum = 0;
             for ($i = 0; $i < $member['box_num']; ++$i) {
                 $rand = $rate * 100;
                 $rnd = rand(1,100);
                 if ($rnd <= $rand){
+                    ++$realBoxNum;
                     $chestItems = LootService::dropOutItem($rewardMeta['chestLoot']);
                     if (count($chestItems)>0){
                         $event = array(
@@ -372,7 +374,7 @@ class RoomBattleDataService extends BaseService {
                     if ($row) {
                         services\BattleBoxService::incDropTotalNum($row['phase'],
                                                                    $row['createtime'],
-                                                                   $member['box_num']);
+                                                                   $realBoxNum);
                     }
                 }
                 $rewardBoxResult = myself()->_mergeAlikeItemKey($rewardBox);