diff --git a/VOL.Ai/Services/AiAppService.cs b/VOL.Ai/Services/AiAppService.cs
index ceec64e..508764a 100644
--- a/VOL.Ai/Services/AiAppService.cs
+++ b/VOL.Ai/Services/AiAppService.cs
@@ -353,7 +353,7 @@ namespace VOL.Ai.Services
                             StudentName = s.StudentName,
                             Sex = s.Sex,
                             Age = s.Age,
-                            Photo = s.Photo,
+                            Photo = s.Photo ?? "",
                             ClassName = c.ClassName,
                             GradeName = g.GradeName,
                             OrderNo = s.OrderNo
@@ -1488,7 +1488,7 @@ namespace VOL.Ai.Services
                         && (paramDto.ClassRoomStageId <= 0 || hrd.ClassroomStageId == paramDto.ClassRoomStageId)
                         select hrd;
 
-            var heartRateDataList = await query.Select(x => new { x.GradeName, x.StudentNo, x.StudentName, x.Sex, x.ClassName, x.Value, x.Strength, x.Consumption, x.ScoreTime }).ToListAsync();
+            var heartRateDataList = await query.ToListAsync();
 
             if (heartRateDataList.Count == 0)
                 return res;