diff --git a/FrontendWebApi/ApiControllers/HistoryController.cs b/FrontendWebApi/ApiControllers/HistoryController.cs
index 3f99f55..d67aaf8 100644
--- a/FrontendWebApi/ApiControllers/HistoryController.cs
+++ b/FrontendWebApi/ApiControllers/HistoryController.cs
@@ -1326,11 +1326,13 @@ namespace FrontendWebApi.ApiControllers
                         var device_item_infos = await frontendRepository.GetAllAsync<DeviceItemInfo>(sqlDeviceItemInfo, new { Device_number = device_number });
 
                         var device_item_info = device_item_infos.Where(x => x.Device_number == device_number && x.Points == point).FirstOrDefault();
+                        var valueType = await backgroundServiceMsSqlRepository.GetOneAsync<string>($"select Data_Type from INFORMATION_SCHEMA.COLUMNS where table_name = '{tableName}' and column_name = 'Value'");
 
                         var sql = $@"select '{device_item_info.Building_name}' as Building_name, '{device_item_info.Main_system_name}' as Main_system_name,
                                             '{device_item_info.Sub_system_name}' as Sub_system_name, '{device_item_info.Device_number}' as Device_number, 
                                             '{device_item_info.Device_name}' as Device_name, '{device_item_info.Item_name}' as Item_name, '{device_item_info.Points}' as Points,
-                                            '{device_item_info.Unit}' as Unit, timestamp as Timestamp, round(value, 2) as Value
+                                            '{device_item_info.Unit}' as Unit, timestamp as Timestamp, 
+                                            {(valueType.Equals("bit") ? "Case when value = 1 then 'true' when value = 0 then 'false' else 'Unknow' End" : "round(value, 2)")} as Value
                                     from {tableName}
                                     where replace(convert(varchar, [timestamp], 111), '/', '-') >= @startTime 
                                         and replace(convert(varchar, [timestamp], 111), '/', '-') <= @endTime order by timestamp";