diff --git a/Learn.Archives.API/Controllers/ExamClassInfoController.cs b/Learn.Archives.API/Controllers/ExamClassInfoController.cs
index ed75abf..1df6bac 100644
--- a/Learn.Archives.API/Controllers/ExamClassInfoController.cs
+++ b/Learn.Archives.API/Controllers/ExamClassInfoController.cs
@@ -84,6 +84,11 @@ namespace Learn.Archives.API.Controllers
             var errorExcelInfo = new List<ImportExamInfoError>();
             var insertUserInfo = new List<ExamUserInfo>();
             var insertClassInfo = new List<ExamClassInfo>();
+            var oldUidAr = await examUserInfoService.AsQueryable()
+                .Where(s => s.ExamId == exam.Id)
+                .Select(s=>s.UserId)
+                .ToArrayAsync();
+            var oldUidHash = oldUidAr.ToHashSet();
             var db = schoolService.Context;
             SqlSugarExpand.SetDbAop(db);
             foreach (var schoolArr in dataList.GroupBy(s => s.School))
@@ -135,6 +140,12 @@ namespace Learn.Archives.API.Controllers
                         return null;
                     }
                     var uid = userDic[name];
+                    if(oldUidHash!=null &&oldUidHash.Contains((long)uid))
+                    {
+                        s.Error = "此学生已经在考试中已经录入过成绩";
+                        errorExcelInfo.Add(s);
+                        return null;
+                    }
                     return new ExamUserInfo()
                     {
                         ExamId = exam.Id,