diff --git a/src/Shentun.Peis.Domain/Asbitems/Asbitem.cs b/src/Shentun.Peis.Domain/Asbitems/Asbitem.cs
index 73fb16e..2cb3666 100644
--- a/src/Shentun.Peis.Domain/Asbitems/Asbitem.cs
+++ b/src/Shentun.Peis.Domain/Asbitems/Asbitem.cs
@@ -194,6 +194,7 @@ namespace Shentun.Peis.Models
         /// 是否启用危急值函数  Y  N
         /// </summary>
         [Column("is_critical_value_function")]
+        [MaxLength(1)]
         public char IsCriticalValueFunction { get; set; }
 
         /// <summary>
@@ -207,6 +208,7 @@ namespace Shentun.Peis.Models
         /// 是否启用随访函数   Y  N
         /// </summary>
         [Column("is_follow_up_function")]
+        [MaxLength(1)]
         public char IsFollowUpFunction { get; set; }
 
 
diff --git a/src/Shentun.Peis.Domain/Items/Item.cs b/src/Shentun.Peis.Domain/Items/Item.cs
index 8c24ace..9afab1b 100644
--- a/src/Shentun.Peis.Domain/Items/Item.cs
+++ b/src/Shentun.Peis.Domain/Items/Item.cs
@@ -166,6 +166,7 @@ namespace Shentun.Peis.Models
         /// 是否启用危急值函数  Y  N
         /// </summary>
         [Column("is_critical_value_function")]
+        [MaxLength(1)]
         public char IsCriticalValueFunction { get; set; }
 
         /// <summary>
@@ -179,6 +180,7 @@ namespace Shentun.Peis.Models
         /// 是否启用随访函数   Y  N
         /// </summary>
         [Column("is_follow_up_function")]
+        [MaxLength(1)]
         public char IsFollowUpFunction { get; set; }