diff --git a/IoTGateway.ViewModel/BasicData/DeviceVariableVMs/DeviceVariableListVM.cs b/IoTGateway.ViewModel/BasicData/DeviceVariableVMs/DeviceVariableListVM.cs
index 4009d04..a9d7476 100644
--- a/IoTGateway.ViewModel/BasicData/DeviceVariableVMs/DeviceVariableListVM.cs
+++ b/IoTGateway.ViewModel/BasicData/DeviceVariableVMs/DeviceVariableListVM.cs
@@ -97,8 +97,8 @@ namespace IoTGateway.ViewModel.BasicData.DeviceVariableVMs
                 var DapThread = deviceService.DeviceThreads.Where(x => x._device.ID == item.DeviceId).FirstOrDefault();
                 if (DapThread?.DeviceValues != null && DapThread.DeviceValues.ContainsKey(item.ID))
                 {
-                    item.Value = DapThread.DeviceValues[item.ID].Value?.ToString();
-                    item.CookedValue = DapThread.DeviceValues[item.ID].CookedValue?.ToString();
+                    item.Value = JsonConvert.SerializeObject(DapThread.DeviceValues[item.ID].Value);
+                    item.CookedValue = JsonConvert.SerializeObject(DapThread.DeviceValues[item.ID].CookedValue);
                     item.State = DapThread.DeviceValues[item.ID].StatusType.ToString();
                 }
             }