diff --git a/SGGL/FineUIPro.Web/HSSE/SitePerson/BlackPersonList.aspx.cs b/SGGL/FineUIPro.Web/HSSE/SitePerson/BlackPersonList.aspx.cs
index 2414ff93..71f6e13d 100644
--- a/SGGL/FineUIPro.Web/HSSE/SitePerson/BlackPersonList.aspx.cs
+++ b/SGGL/FineUIPro.Web/HSSE/SitePerson/BlackPersonList.aspx.cs
@@ -174,6 +174,8 @@ namespace FineUIPro.Web.HSSE.SitePerson
             var result = Funs.DB.SitePerson_Person.FirstOrDefault(x => x.PersonId == PersonId);
             if (result != null)
             {
+                result.ExchangeTime = null;
+                result.ExchangeTime2 = null;
                 result.IsBlacklist = false;
                 Funs.DB.SubmitChanges();
                 BindGrid();
diff --git a/SGGL/FineUIPro.Web/HSSE/SitePerson/PersonList.aspx.cs b/SGGL/FineUIPro.Web/HSSE/SitePerson/PersonList.aspx.cs
index f44f4874..6b59cb57 100644
--- a/SGGL/FineUIPro.Web/HSSE/SitePerson/PersonList.aspx.cs
+++ b/SGGL/FineUIPro.Web/HSSE/SitePerson/PersonList.aspx.cs
@@ -723,6 +723,8 @@ namespace FineUIPro.Web.HSSE.SitePerson
             var result = Funs.DB.SitePerson_Person.FirstOrDefault(x => x.PersonId == PersonId);
             if (result != null)
             {
+                result.ExchangeTime = null;
+                result.ExchangeTime2 = null;
                 result.IsBlacklist = true;
                 Funs.DB.SubmitChanges();
                 BindGrid();