diff --git a/FrontendWebApi/Models/HistoryClass.cs b/FrontendWebApi/Models/HistoryClass.cs
index 4a94438..46dbd4f 100644
--- a/FrontendWebApi/Models/HistoryClass.cs
+++ b/FrontendWebApi/Models/HistoryClass.cs
@@ -281,7 +281,13 @@ namespace FrontendWebApi.Models
     }
     public class HistoryBuildingDevice
     {
-        public string building_tag { get; set; }
+        private string _building_tag;
+
+        public string building_tag
+        {
+            get { return _building_tag; }
+            set { _building_tag = value.Replace("$3", ""); }
+        }
         public string building_name { get; set; }
         public List<HistoryDevice> device_list { get; set; }
      
@@ -360,14 +366,30 @@ namespace FrontendWebApi.Models
 
     public class HistoryRawData : DeviceItemInfo
     {
-        public string Value { get; set; }
+        private string _Value;
+        public string Value
+        {
+            get { return _Value; }
+            set
+            {
+                _Value = StringHelper.TruncateDecimal(value);
+            }
+        }
         public string Timestamp { get; set; }
     }
 
     public class HistoryExport
     {
+        private string _value;
         public string deviceName { get; set; }
-        public string value { get; set; }
+        public string value
+        {
+            get { return _value; }
+            set
+            {
+                _value = StringHelper.TruncateDecimal(value);
+            }
+        }
         public DateTime timestamp { get; set; }
         public DateTime starttime { get; set; }
         public DateTime? endtime { get; set; }
@@ -376,6 +398,22 @@ namespace FrontendWebApi.Models
         public string building_tag { get; set; }
         public string device_number { get; set; }
     }
+    public static class StringHelper
+    {
+        // 截取小數點後兩位數字
+        public static string TruncateDecimal(string input)
+        {
+            // 如果是科學記號先做解析，再截取
+            if (double.TryParse(input, out double number))
+            {
+                return number.ToString("F2");
+            }
+            else
+            {
+                return string.Empty;
+            }
+        }
+    }
 
     public class History_Building
     { 
@@ -386,11 +424,16 @@ namespace FrontendWebApi.Models
 
     public class DeviceNumberPoint
     {
+        private string _FullDeviceNumberPoint;
         public string DeviceNumber { get; set; }
         public string Point { get; set; }
-        public string FullDeviceNumberPoint { get; set; }
+        public string FullDeviceNumberPoint
+        {
+            get { return _FullDeviceNumberPoint; }
+            set { _FullDeviceNumberPoint = value.Replace("$3", ""); }
+        }
     }
-    
+
     public class BuildStation
     {
         public string system_value { get; set; }