diff --git a/src/main/java/com/project/exam/domain/service/impl/AssemblePaperDomainServiceImpl.java b/src/main/java/com/project/exam/domain/service/impl/AssemblePaperDomainServiceImpl.java
index 87cf11d..80c341b 100644
--- a/src/main/java/com/project/exam/domain/service/impl/AssemblePaperDomainServiceImpl.java
+++ b/src/main/java/com/project/exam/domain/service/impl/AssemblePaperDomainServiceImpl.java
@@ -206,7 +206,15 @@ public class AssemblePaperDomainServiceImpl implements AssemblePaperDomainServic
         });
         // 带权乱序（A-Res算法）
         return kpList.stream()
-                .sorted(Comparator.comparingDouble(kp -> -Math.pow(ThreadLocalRandom.current().nextDouble(), 1.0 / kp.getWeightScore())))
+                // 1. 先把对象和计算好的随机分数封装起来（保证每个元素在本次排序中分数固定）
+                .map(kp -> {
+                    double score = Math.pow(ThreadLocalRandom.current().nextDouble(), 1.0 / kp.getWeightScore());
+                    return new AbstractMap.SimpleEntry<>(kp, score);
+                })
+                // 2. 根据预先计算好的分数进行排序（降序排列，分数越高权重越大）
+                .sorted((e1, e2) -> Double.compare(e2.getValue(), e1.getValue()))
+                // 3. 还原回原始对象并取结果
+                .map(Map.Entry::getKey)
                 .limit(totalNum)
                 .toList();
     }