diff --git a/Learn.Archives.Core/Model/Student.cs b/Learn.Archives.Core/Model/Student.cs
index a38227a..7fbd550 100644
--- a/Learn.Archives.Core/Model/Student.cs
+++ b/Learn.Archives.Core/Model/Student.cs
@@ -25,7 +25,7 @@ namespace Learn.Archives.Core.Model
         /// <summary>
         /// 减免金额
         /// </summary>
-        [SugarColumn(DecimalDigits =2)]
+        [SugarColumn(DecimalDigits =2, IsNullable = true)]
         public decimal AmountRelief { get; set; }
         /// <summary>
         /// 减免是否申请