diff --git a/DMS.Application/DTOs/VariableDto.cs b/DMS.Application/DTOs/VariableDto.cs
index 2a0b2c3..b39ae39 100644
--- a/DMS.Application/DTOs/VariableDto.cs
+++ b/DMS.Application/DTOs/VariableDto.cs
@@ -12,7 +12,36 @@ public class VariableDto
     public string Name { get; set; }
     public string S7Address { get; set; }
     public string DataValue { get; set; }
+    public double NumericValue { get; set; }
     public string DisplayValue { get; set; }
+
+    /// <summary>
+    /// 更新数值属性，根据DataValue的值进行转换。
+    /// </summary>
+    public void UpdateNumericValue()
+    {
+        if (string.IsNullOrEmpty(DataValue))
+        {
+            NumericValue = 0.0;
+            return;
+        }
+
+        // 尝试将字符串转换为数值
+        if (double.TryParse(DataValue, out double numericValue))
+        {
+            NumericValue = numericValue;
+        }
+        // 如果是布尔值
+        else if (bool.TryParse(DataValue, out bool boolValue))
+        {
+            NumericValue = boolValue ? 1.0 : 0.0;
+        }
+        // 如果无法转换，保持为0.0
+        else
+        {
+            NumericValue = 0.0;
+        }
+    }
     public VariableTableDto? VariableTable { get; set; }
     public List<VariableMqttAliasDto>? MqttAliases { get; set; } = new List<VariableMqttAliasDto>();
     public SignalType SignalType { get; set; }
diff --git a/DMS.Core/Models/Variable.cs b/DMS.Core/Models/Variable.cs
index 69b55fa..a041509 100644
--- a/DMS.Core/Models/Variable.cs
+++ b/DMS.Core/Models/Variable.cs
@@ -99,6 +99,40 @@ public class Variable
     /// </summary>
     public string DataValue { get; set; }
 
+    /// <summary>
+    /// 存储从设备读取到的最新数值。如果原始值是布尔类型，则True转换为1.0，False转换为0.0。
+    /// 此属性不应持久化到数据库，仅用于运行时。
+    /// </summary>
+    public double NumericValue { get; set; }
+
+    /// <summary>
+    /// 更新数值属性，根据DataValue的值进行转换。
+    /// </summary>
+    public void UpdateNumericValue()
+    {
+        if (string.IsNullOrEmpty(DataValue))
+        {
+            NumericValue = 0.0;
+            return;
+        }
+
+        // 尝试将字符串转换为数值
+        if (double.TryParse(DataValue, out double numericValue))
+        {
+            NumericValue = numericValue;
+        }
+        // 如果是布尔值
+        else if (bool.TryParse(DataValue, out bool boolValue))
+        {
+            NumericValue = boolValue ? 1.0 : 0.0;
+        }
+        // 如果无法转换，保持为0.0
+        else
+        {
+            NumericValue = 0.0;
+        }
+    }
+
     /// <summary>
     /// 变量的通讯协议。
     /// </summary>
diff --git a/DMS.Infrastructure/Services/OpcUaService.cs b/DMS.Infrastructure/Services/OpcUaService.cs
index 04e3d5d..9db6ec4 100644
--- a/DMS.Infrastructure/Services/OpcUaService.cs
+++ b/DMS.Infrastructure/Services/OpcUaService.cs
@@ -81,6 +81,30 @@ namespace DMS.Infrastructure.Services
         {
             if (_session != null)
             {
+                // 取消所有订阅
+                if (_subscription != null)
+                {
+                    try
+                    {
+                        // 删除服务器上的订阅
+                        _subscription.Delete(true);
+                        // 从会话中移除订阅
+                        _session.RemoveSubscription(_subscription);
+                        // 释放订阅资源
+                        _subscription.Dispose();
+                        _subscription = null;
+                    }
+                    catch (Exception ex)
+                    {
+                        Console.WriteLine($"取消订阅时发生错误: {ex.Message}");
+                        // 即使取消订阅失败，也继续关闭会话
+                    }
+                }
+                
+                // 清理订阅节点跟踪字典
+                _subscribedNodes.Clear();
+
+                // 关闭会话
                 await _session.CloseAsync();
                 _session = null;
             }
diff --git a/DMS.Infrastructure/Services/OpcUaServiceManager.cs b/DMS.Infrastructure/Services/OpcUaServiceManager.cs
index 4d77a8c..69d40c7 100644
--- a/DMS.Infrastructure/Services/OpcUaServiceManager.cs
+++ b/DMS.Infrastructure/Services/OpcUaServiceManager.cs
@@ -336,6 +336,7 @@ namespace DMS.Infrastructure.Services
                         // 更新变量值
                         variable.DataValue = newValue;
                         variable.DisplayValue = newValue;
+                        variable.UpdateNumericValue(); // 更新数值属性
                         variable.UpdatedAt = DateTime.Now;
 
                         _logger.LogDebug($"节点：{variable.OpcUaNodeId}值发生了变化:{newValue}");
diff --git a/DMS.WPF/ViewModels/Items/VariableItemViewModel.cs b/DMS.WPF/ViewModels/Items/VariableItemViewModel.cs
index 469d684..842ac98 100644
--- a/DMS.WPF/ViewModels/Items/VariableItemViewModel.cs
+++ b/DMS.WPF/ViewModels/Items/VariableItemViewModel.cs
@@ -41,6 +41,12 @@ public partial class VariableItemViewModel : ObservableObject
     [ObservableProperty]
     private string? _dataValue;
 
+    /// <summary>
+    /// 获取或设置从设备读取到的数值。如果原始值是布尔类型，则True转换为1.0，False转换为0.0。
+    /// </summary>
+    [ObservableProperty]
+    private double _numericValue;
+
     /// <summary>
     /// 获取或设置用于在界面上显示的值。
     /// 这可能是经过公式转换、格式化或添加了单位后的值。
@@ -48,6 +54,32 @@ public partial class VariableItemViewModel : ObservableObject
     [ObservableProperty]
     private string? _displayValue;
 
+    partial void OnDataValueChanged(string? oldValue, string? newValue)
+    {
+        // 当DataValue发生变化时，更新NumericValue
+        if (string.IsNullOrEmpty(newValue))
+        {
+            NumericValue = 0.0;
+            return;
+        }
+
+        // 尝试将字符串转换为数值
+        if (double.TryParse(newValue, out double numericValue))
+        {
+            NumericValue = numericValue;
+        }
+        // 如果是布尔值
+        else if (bool.TryParse(newValue, out bool boolValue))
+        {
+            NumericValue = boolValue ? 1.0 : 0.0;
+        }
+        // 如果无法转换，保持为0.0
+        else
+        {
+            NumericValue = 0.0;
+        }
+    }
+
     /// <summary>
     /// 获取或设置此变量所属的变量表 (VariableTable) 的数据传输对象 (DTO)。
     /// 用于在界面上显示变量表的关联信息。