diff --git a/IRaCIS.Core.Application/Service/Reading/ReadModuleService.cs b/IRaCIS.Core.Application/Service/Reading/ReadModuleService.cs
index a7e8616a6..305e6f0b9 100644
--- a/IRaCIS.Core.Application/Service/Reading/ReadModuleService.cs
+++ b/IRaCIS.Core.Application/Service/Reading/ReadModuleService.cs
@@ -93,9 +93,14 @@ namespace IRaCIS.Application.Services
                 TotalCount =await subjectQuery.Select(x => x.SubjectId).Distinct().CountAsync(),
             };
 
+            var maxcount = 0;
+            pageOutput.CurrentPageData.ForEach(x => {
+                maxcount = maxcount < x.Data.Count ? x.Data.Count : maxcount;
+            });
+
             return (pageOutput, new
             {
-                MaxLength = pageOutput.CurrentPageData.ToList().Max(x => x.Data.Count)
+                MaxLength = maxcount
             });
 
             #region 用导航属性写的 有问题