diff --git a/webapp/services/BattleDataService.php b/webapp/services/BattleDataService.php
index 76174ddc..b4efcfcf 100644
--- a/webapp/services/BattleDataService.php
+++ b/webapp/services/BattleDataService.php
@@ -541,18 +541,30 @@ class BattleDataService extends BaseService {
             $bossReward = getReqVal('pve_kill_boss', 0) ? 1 : 0;
             $heroQuality = $this->heroDto['quality'];
 
-            $dropRate = max(1.15 - ($heroQuality - $instanceLevel) * 0.25, 0);
-            $dropMul = 0.8 - ($instanceRank - 1) * 0.25 + $bossReward * 0.2;
-
-            $heroProbability = min($heroFragmentNum / $onlineNum *
-                                   $dropRate * ($instanceRankRate + $bossReward*0.2) *
-                                   pow(2, $todayPveBattleTimes - $todayPveGetFragmentNum -1), 1);
-            $gunProbability = min($gunFragmentNum / $onlineNum *
-                                  $dropRate * ($instanceRankRate + $bossReward*0.2) *
-                                  pow(2, $todayPveBattleTimes - $todayPveGetFragmentNum -1), 1);
-
-            $heroProbability = max($heroProbability, 0);
-            $gunProbability = max($gunProbability, 0);
+            $heroProbability = FormulaService::calcHeroFragmentProbabilityPve
+                             (
+                                 $heroQuality,
+                                 $onlineNum,
+                                 $heroFragmentNum,
+                                 $todayPveBattleTimes,
+                                 $instanceLevel,
+                                 $instanceRank,
+                                 $instanceRankRate,
+                                 $bossReward,
+                                 $todayPveGetFragmentNum
+                             );
+            $gunProbability = FormulaService::calcWeaponFragmentProbabilityPve
+                             (
+                                 $heroQuality,
+                                 $onlineNum,
+                                 $gunFragmentNum,
+                                 $todayPveBattleTimes,
+                                 $instanceLevel,
+                                 $instanceRank,
+                                 $instanceRankRate,
+                                 $bossReward,
+                                 $todayPveGetFragmentNum
+                             );
             $emptyProbability = max(1 - $heroProbability - $gunProbability, 0);
 
             $dropIdx = $this->randWeight(array($heroProbability, $gunProbability, $emptyProbability));
diff --git a/webapp/services/FormulaService.php b/webapp/services/FormulaService.php
index b54e070f..bf67b5c7 100644
--- a/webapp/services/FormulaService.php
+++ b/webapp/services/FormulaService.php
@@ -150,6 +150,44 @@ class FormulaService extends BaseService {
         return max(0, $weaponProbability);
     }
 
+    public static function calcHeroFragmentProbabilityPve($heroQuality,
+                                                          $onlineNum,
+                                                          $heroFragmentNum,
+                                                          $todayPvpBattleTimes,
+                                                          $instanceLevel,
+                                                          $instanceRank,
+                                                          $instanceRankRate,
+                                                          $bossReward,
+                                                          $todayPveGetFragmentNum)
+    {
+        $dropRate = max(1.15 - ($heroQuality - $instanceLevel) * 0.25, 0);
+        $dropMul = 0.8 - ($instanceRank - 1) * 0.25 + $bossReward * 0.2;
+
+        $heroProbability = min($heroFragmentNum / $onlineNum *
+                               $dropRate * ($instanceRankRate + $bossReward*0.2) *
+                               pow(2, $todayPveBattleTimes - $todayPveGetFragmentNum - 1), 1);
+        return max(0, $heroProbability);
+    }
+
+    public static function calcWeaponFragmentProbabilityPve($heroQuality,
+                                                            $onlineNum,
+                                                            $gunFragmentNum,
+                                                            $todayPvpBattleTimes,
+                                                            $instanceLevel,
+                                                            $instanceRank,
+                                                            $instanceRankRate,
+                                                            $bossReward,
+                                                            $todayPveGetFragmentNum)
+    {
+        $dropRate = max(1.15 - ($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);
+        return max(0, $gunProbability);
+    }
+
     public static function getHeroPvpTiliTotalValue($heroDb)
     {
         //ROUND((0.0241*角色NFT阶数^3-0.5675*角色NFT阶数^2+7.1798*角色NFT阶数+2.4114)+(0.0161*角色幸运值^3-1.2943*角色幸运值^2+36.5664*角色幸运值-336.144),0)+系统参数