diff --git a/InSituLaboratory.Service/SysStatusService.cs b/InSituLaboratory.Service/SysStatusService.cs
index db15fad..f4986de 100644
--- a/InSituLaboratory.Service/SysStatusService.cs
+++ b/InSituLaboratory.Service/SysStatusService.cs
@@ -21,7 +21,7 @@ namespace InSituLaboratory.Service
         /// <returns></returns>
         public IEnumerable<SysStatus> GetSysStauts()
         {
-            return this.Set<SysStatus>().OrderByDescending(n => n.CreateTime);
+            return this.Query<SysStatus>(m => true).OrderByDescending(n => n.CreateTime).AsNoTracking();
         }
 
         /// <summary>
@@ -30,7 +30,7 @@ namespace InSituLaboratory.Service
         /// <returns></returns>
         public IEnumerable<CurrentWorkEquipment> GetCurrentWorkEquipment()
         {
-            return this.Set<CurrentWorkEquipment>().OrderByDescending(n => n.CreateTime);
+            return this.Set<CurrentWorkEquipment>().OrderByDescending(n => n.CreateTime).AsNoTracking();
         }
 
         /// <summary>
@@ -39,7 +39,7 @@ namespace InSituLaboratory.Service
         /// <returns></returns>
         public IEnumerable<CurrentFaultyEquipment> GetCurrentFaultyEquipment()
         {
-            return this.Set<CurrentFaultyEquipment>().OrderByDescending(n => n.CreateTime);
+            return this.Set<CurrentFaultyEquipment>().OrderByDescending(n => n.CreateTime).AsNoTracking();
         }
 
 
diff --git a/InSituLaboratory/ViewModels/Pages/DashboardViewModel.cs b/InSituLaboratory/ViewModels/Pages/DashboardViewModel.cs
index a0de99a..d8f63a3 100644
--- a/InSituLaboratory/ViewModels/Pages/DashboardViewModel.cs
+++ b/InSituLaboratory/ViewModels/Pages/DashboardViewModel.cs
@@ -43,7 +43,7 @@ namespace InSituLaboratory.ViewModels.Pages
             var currentFaultylist = _sysStatusService.GetCurrentFaultyEquipment().ToList();
             if (sysStatuslist.Count() != 0)
             {
-                var data = _sysStatusService.GetSysStauts().First();
+                var data = _sysStatusService.GetSysStauts().FirstOrDefault();
                 SysStatusModel.PackagingTime = data.PackagingTime;
                 SysStatusModel.SamplingTime = data.SamplingTime;
                 SysStatusModel.Voltage48 = data.Voltage48;