diff --git a/luoo_user/src/main/java/com/luoo/user/pojo/LotteryUser.java b/luoo_user/src/main/java/com/luoo/user/pojo/LotteryUser.java
index 4b22f2d..ccb8868 100644
--- a/luoo_user/src/main/java/com/luoo/user/pojo/LotteryUser.java
+++ b/luoo_user/src/main/java/com/luoo/user/pojo/LotteryUser.java
@@ -52,7 +52,6 @@ public class LotteryUser {
   @ApiModelProperty(value = "用户id")
   private String userId;
 
-  @NotNull
   @Column(name = "region_id", nullable = false)
   @ApiModelProperty(value = "区域id")
   private Integer regionId;
diff --git a/luoo_user/src/main/java/com/luoo/user/service/DrawLotteryService.java b/luoo_user/src/main/java/com/luoo/user/service/DrawLotteryService.java
index 9bb6ff9..23f4596 100644
--- a/luoo_user/src/main/java/com/luoo/user/service/DrawLotteryService.java
+++ b/luoo_user/src/main/java/com/luoo/user/service/DrawLotteryService.java
@@ -148,9 +148,14 @@ public class DrawLotteryService {
      * @return 中奖者列表
      */
     private List<LotteryUser> drawWinners(List<LotteryUser> list, int winnersCount) {
-        List<LotteryUser> winners = new ArrayList<>();
-        Collections.shuffle(winners, new Random());
-        return winners.subList(0, Math.min(winnersCount, winners.size()));
+        // 创建一个新列表，以便对它进行洗牌操作而不影响原始列表
+        List<LotteryUser> shuffledList = new ArrayList<>(list);
+
+        // 对新列表进行洗牌操作
+        Collections.shuffle(shuffledList, new Random());
+
+        // 返回前 winnersCount 个元素
+        return shuffledList.subList(0, Math.min(winnersCount, shuffledList.size()));
     }
 
 }