diff --git a/VOL.Ai/Services/AiAppService.cs b/VOL.Ai/Services/AiAppService.cs
index e7b078a..bfdf96e 100644
--- a/VOL.Ai/Services/AiAppService.cs
+++ b/VOL.Ai/Services/AiAppService.cs
@@ -1865,7 +1865,10 @@ namespace VOL.Ai.Services
             res.PeopleNumber = $"{heartRateDataList.GroupBy(x => x.StudentNo).Count()}/{classRoomStudent.Count}";
             res.PeopleNumberBySex = $"{classRoomStudent.Count(x => x.Sex == SexType.Male)}/{classRoomStudent.Count(x => x.Sex == SexType.Female)}";
 
-            res.AvgHR = $"{(int)(heartRateDataList.Sum(x => x.Value) / heartRateDataList.Count)} 次/分";
+            res.AvgHR = heartRateDataList.Count > 0
+                ? $"{(int)(heartRateDataList.Sum(x => x.Value) / heartRateDataList.Count)} 次/分"
+                : "0 次/分";
+
             res.Consumption = heartRateDataList.Count > 0 ? $"{Math.Abs(heartRateDataList.Sum(x => x.Consumption ?? 0) / heartRateDataList.Count)} 千卡" : "";
             //res.Density = $"{(int)(heartRateDataList.Where(x => x.Strength > 50).Sum(x => x.Strength) / heartRateDataList.Count)} %";