diff --git a/Server/YD_XinWei/Services/Impl/LargeScreenService.cs b/Server/YD_XinWei/Services/Impl/LargeScreenService.cs
index d424af3..92f7250 100644
--- a/Server/YD_XinWei/Services/Impl/LargeScreenService.cs
+++ b/Server/YD_XinWei/Services/Impl/LargeScreenService.cs
@@ -309,10 +309,10 @@ namespace YD_XinWei.Api.Services.Impl
                 .ToListAsync();
 
             // 2. 内存分组取每个学生最新一条
-            var realTimeResults = sourceData
-                .GroupBy(x => x.StudentNo)                          // 按学生分组
-                .Select(g => g.MaxBy(x => x.ScoreTime))             // 每组取最新一条
-                .Where(x => x != null)                              // 避免空值
+            var latestPerStudent = sourceData.OrderBy(x => x.ScoreTime).ToList();
+
+            // 3. 映射到 DTO
+            var realTimeResults = latestPerStudent
                 .Select(x => new ItemRealTimeResultDto
                 {
                     StudentNo = x.StudentNo,
@@ -320,9 +320,7 @@ namespace YD_XinWei.Api.Services.Impl
                     Photo = studentPhotoDict.TryGetValue(x.StudentNo, out var photo) ? photo : string.Empty,
                     GradeAndClassName = $"{x.GradeName}-{x.ClassName}",
                     CategoryValue = x.CategoryValue,
-                    Value = x.CategoryValue == 1
-                        ? $"{x.Height}cm/{x.Weight}kg"
-                        : $"{x.Value}{((SportsTestItemType)x.CategoryValue).GetUnit()}",
+                    Value = x.CategoryValue == 1 ? $"{x.Height}cm/{x.Weight}kg" : $"{x.Value}{((SportsTestItemType)x.CategoryValue).GetUnit()}",
                     Score = x.Score,
                     Rank = string.IsNullOrEmpty(x.Rank) ? "不及格" : x.Rank,
                     ScoreTime = x.ScoreTime.ToString("yyyy-MM-dd HH:mm:ss")