diff --git a/webapp/bootstrap/constant.php b/webapp/bootstrap/constant.php
index 9e56f8c2..008009ee 100644
--- a/webapp/bootstrap/constant.php
+++ b/webapp/bootstrap/constant.php
@@ -34,6 +34,7 @@ define('TN_DAILY_PVE_BATTLE_TIMES', 9006);
 define('TN_DAILY_PVE_GET_FRAGMENT_NUM', 9007);
 define('TN_DAILY_PVP_BATTLE_TIMES', 9008);
 define('TN_DAILY_PVP_GET_FRAGMENT_NUM', 9009);
+define('TN_DAILY_PVE_LAST_GET_FRAGMENT_BATTLE', 9010);
 define('TN_DAILY_END', 9009);
 
 define('TN_WEEKLY_BEGIN', 10001);
diff --git a/webapp/services/BattleDataService.php b/webapp/services/BattleDataService.php
index eebc8967..7d489e43 100644
--- a/webapp/services/BattleDataService.php
+++ b/webapp/services/BattleDataService.php
@@ -547,6 +547,7 @@ class BattleDataService extends BaseService {
     private function rewardFragmentPve()
     {
         $todayPveBattleTimes = myself()->_getDailyV(TN_DAILY_PVE_BATTLE_TIMES, 0);
+        $todayPveLastGetFragmentBattle = myself()->_getDailyV(TN_DAILY_PVE_LAST_GET_FRAGMENT_BATTLE, 0);
         $todayPveGetFragmentNum = myself()->_getDailyV(TN_DAILY_PVE_GET_FRAGMENT_NUM, 0);
         $todayPvpGetFragmentNum = myself()->_getDailyV(TN_DAILY_PVP_GET_FRAGMENT_NUM, 0);
 
@@ -571,7 +572,7 @@ class BattleDataService extends BaseService {
                                  $instanceRank,
                                  $instanceRankRate,
                                  $bossReward,
-                                 $todayPveGetFragmentNum
+                                 $todayPveLastGetFragmentBattle
                              );
             $gunProbability = FormulaService::calcWeaponFragmentProbabilityPve
                              (
@@ -583,7 +584,7 @@ class BattleDataService extends BaseService {
                                  $instanceRank,
                                  $instanceRankRate,
                                  $bossReward,
-                                 $todayPveGetFragmentNum
+                                 $todayPveLastGetFragmentBattle
                              );
             $emptyProbability = max(1 - $heroProbability - $gunProbability, 0);
 
@@ -749,6 +750,9 @@ class BattleDataService extends BaseService {
 
     private function procDrop($dropIdx)
     {
+        $todayPveBattleTimes = myself()->_getDailyV(TN_DAILY_PVE_BATTLE_TIMES, 0);
+        $todayPveLastGetFragmentBattle = myself()->_getDailyV(TN_DAILY_PVE_LAST_GET_FRAGMENT_BATTLE, 0);
+
         $propertyChgService = new services\PropertyChgService();
         $awardService = new services\AwardService();
         $matchMode = getReqVal('match_mode', 0);
@@ -771,6 +775,7 @@ class BattleDataService extends BaseService {
                 );
                 if ($matchMode == self::MATCH_MODE_PVE) {
                     myself()->_incDailyV(TN_DAILY_PVE_GET_FRAGMENT_NUM, 0, 1);
+                    myself()->_setDailyV(TN_DAILY_PVE_LAST_GET_FRAGMENT_BATTLE, 0, $todayPveBattleTimes + 1);
                 } else {
                     myself()->_incDailyV(TN_DAILY_PVP_GET_FRAGMENT_NUM, 0, 1);
                 }
@@ -794,6 +799,7 @@ class BattleDataService extends BaseService {
                 );
                 if ($matchMode == self::MATCH_MODE_PVE) {
                     myself()->_incDailyV(TN_DAILY_PVE_GET_FRAGMENT_NUM, 0, 1);
+                    myself()->_setDailyV(TN_DAILY_PVE_LAST_GET_FRAGMENT_BATTLE, 0, $todayPveBattleTimes + 1);
                 } else {
                     myself()->_incDailyV(TN_DAILY_PVP_GET_FRAGMENT_NUM, 0, 1);
                 }
diff --git a/webapp/services/FormulaService.php b/webapp/services/FormulaService.php
index e5c6fa9a..976ea568 100644
--- a/webapp/services/FormulaService.php
+++ b/webapp/services/FormulaService.php
@@ -158,7 +158,8 @@ class FormulaService extends BaseService {
                                                           $instanceRank,
                                                           $instanceRankRate,
                                                           $bossReward,
-                                                          $todayPveGetFragmentNum)
+                                                          $todayPveLastGetFragmentBattle
+                                                          )
     {
         $dropRate = max(1.15 - ($heroQuality - $instanceLevel) * 0.25, 0);
         $dropMul = 0.8 - ($instanceRank - 1) * 0.25 + $bossReward * 0.2;
@@ -178,14 +179,15 @@ class FormulaService extends BaseService {
                                                             $instanceRank,
                                                             $instanceRankRate,
                                                             $bossReward,
-                                                            $todayPveGetFragmentNum)
+                                                            $todayPveLastGetFragmentBattle
+                                                            )
     {
         $dropRate = max(1.15 - ($heroQuality - $instanceLevel) * 0.25, 0);
         $dropMul = 0.8 - ($instanceRank - 1) * 0.25 + $bossReward * 0.2;
 
         $gunProbability = min($gunFragmentNum / $onlineNum *
                               $dropRate * ($instanceRankRate + $bossReward*0.2) *
-                              pow(2, $todayPveBattleTimes - $todayPveGetFragmentNum - 1), 1);
+                              pow(2, $todayPveBattleTimes - $todayPveLastGetFragmentBattle - 1), 1);
         error_log(json_encode(func_get_args()));
         return max(0, $gunProbability);
     }