diff --git a/App.xaml.cs b/App.xaml.cs
index 138c7a7..f0b8d09 100644
--- a/App.xaml.cs
+++ b/App.xaml.cs
@@ -208,10 +208,10 @@ namespace DrillTools
                 if (scalingWindow.ScalingResult == null)
                     return;
 
-                var (kx, ky) = scalingWindow.ScalingResult.Value;
+                var result = scalingWindow.ScalingResult.Value;
 
                 string content = CommandTypeFileReader.ReadAllText(filePath);
-                string scaledContent = Integration.ExcellonScaler.Scale(content, kx, ky);
+                string scaledContent = Integration.ExcellonScaler.Scale(content, result.Kx, result.Ky);
 
                 // 备份原文件
                 string backupFilePath = filePath + ".bak";
@@ -226,6 +226,19 @@ namespace DrillTools
                     "涨缩完成",
                     MessageBoxButton.OK,
                     MessageBoxImage.Information);
+
+                // 系数记忆：将本次模式与原始输入连同源文件名写入 ini，供下次载入。
+                // 属辅助功能，失败不回滚已完成的涨缩，单独提示。
+                try
+                {
+                    ScalingProfileStore.Save(result.Mode, result.InputX, result.InputY, Path.GetFileName(filePath));
+                }
+                catch (Exception ex)
+                {
+                    System.Windows.MessageBox.Show(
+                        $"系数记忆保存失败：\n{ex.Message}\n本次涨缩已完成，不影响结果。",
+                        "系数记忆", MessageBoxButton.OK, MessageBoxImage.Warning);
+                }
             }
             catch (Exception ex)
             {
diff --git a/DrillScalingWindow.xaml b/DrillScalingWindow.xaml
index 1cf1069..9c71c2e 100644
--- a/DrillScalingWindow.xaml
+++ b/DrillScalingWindow.xaml
@@ -82,6 +82,12 @@
         <StackPanel Grid.Row="4"
                     HorizontalAlignment="Right"
                     Orientation="Horizontal">
+            <Button Name="LoadLastButton"
+                    Width="110"
+                    Height="30"
+                    Content="载入上次系数"
+                    Margin="0,0,10,0"
+                    Click="LoadLastButton_Click" />
             <Button Width="80"
                     Height="30"
                     Content="取消"
diff --git a/DrillScalingWindow.xaml.cs b/DrillScalingWindow.xaml.cs
index 62ce52d..20ad616 100644
--- a/DrillScalingWindow.xaml.cs
+++ b/DrillScalingWindow.xaml.cs
@@ -10,9 +10,10 @@ namespace DrillTools
         private readonly DrillScalingViewModel _viewModel;
 
         /// <summary>
-        /// 用户确认后的缩放结果（kx, ky）
+        /// 用户确认后的缩放结果。
+        /// 保留模式与原始输入（用于系数记忆落盘），同时携带换算后的倍率（用于实际缩放）。
         /// </summary>
-        public (double Kx, double Ky)? ScalingResult { get; private set; }
+        public (ScalingMode Mode, string InputX, string InputY, double Kx, double Ky)? ScalingResult { get; private set; }
 
         public DrillScalingWindow()
         {
@@ -42,11 +43,42 @@ namespace DrillTools
                 return;
             }
 
-            ScalingResult = (_viewModel.Kx, _viewModel.Ky);
+            ScalingResult = (_viewModel.Mode, _viewModel.InputX, _viewModel.InputY, _viewModel.Kx, _viewModel.Ky);
             DialogResult = true;
             Close();
         }
 
+        /// <summary>
+        /// 载入上次涨缩系数：实时读取 ini 并回填模式与输入框。
+        /// RadioButton 与 Mode 为单向事件绑定，模式回填需手动同步 RadioButton 状态。
+        /// </summary>
+        private void LoadLastButton_Click(object sender, RoutedEventArgs e)
+        {
+            try
+            {
+                var record = ScalingProfileStore.Load();
+                if (record == null)
+                {
+                    System.Windows.MessageBox.Show("没有可载入的上次系数记录。", "载入上次系数",
+                        MessageBoxButton.OK, MessageBoxImage.Information);
+                    return;
+                }
+
+                // 先同步 RadioButton（设目标项为 true，靠同组互斥取消另一项，并触发 ModeRadioButton_Changed 联动 Mode 与派生标签），再回填输入框
+                if (record.Mode == ScalingMode.Ratio)
+                    RatioRadioButton.IsChecked = true;
+                else
+                    PpmRadioButton.IsChecked = true;
+                _viewModel.InputX = record.InputX;
+                _viewModel.InputY = record.InputY;
+            }
+            catch (Exception ex)
+            {
+                System.Windows.MessageBox.Show($"载入上次系数失败：\n{ex.Message}", "错误",
+                    MessageBoxButton.OK, MessageBoxImage.Error);
+            }
+        }
+
         private void CancelButton_Click(object sender, RoutedEventArgs e)
         {
             ScalingResult = null;
diff --git a/ScalingProfileStore.cs b/ScalingProfileStore.cs
new file mode 100644
index 0000000..4eade38
--- /dev/null
+++ b/ScalingProfileStore.cs
@@ -0,0 +1,125 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Text;
+
+namespace DrillTools
+{
+    /// <summary>
+    /// 二钻涨缩系数的 ini 持久化存储。
+    /// 存放于 %LocalAppData%\DrillTools\scaling.ini，UTF-8 无 BOM，
+    /// 只保留最近一次涨缩记录（模式 + 输入值 + 源文件名）。
+    /// </summary>
+    internal static class ScalingProfileStore
+    {
+        private const string SectionName = "LastScaling";
+        private const string KeyMode = "Mode";
+        private const string KeyInputX = "InputX";
+        private const string KeyInputY = "InputY";
+        private const string KeyFileName = "FileName";
+
+        /// <summary>
+        /// ini 配置文件完整路径：%LocalAppData%\DrillTools\scaling.ini
+        /// </summary>
+        private static string GetIniPath()
+        {
+            string dir = Path.Combine(
+                Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData),
+                "DrillTools");
+            return Path.Combine(dir, "scaling.ini");
+        }
+
+        /// <summary>
+        /// 读取上次涨缩记录。
+        /// 文件不存在或缺少必需键（含模式无法解析）时返回 null；其它 IO 异常向上抛出，由调用边界处理。
+        /// </summary>
+        public static ScalingRecord? Load()
+        {
+            string path = GetIniPath();
+            if (!File.Exists(path))
+                return null;
+
+            // 简易 ini 解析：按 [section] 切节，仅在目标节内收集 key=value
+            var values = new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase);
+            bool inSection = false;
+            foreach (var raw in File.ReadAllLines(path))
+            {
+                string line = raw.Trim();
+                if (line.Length == 0 || line.StartsWith(";"))
+                    continue;
+
+                // 节标题
+                if (line.StartsWith("[") && line.EndsWith("]"))
+                {
+                    inSection = line.Equals($"[{SectionName}]", StringComparison.OrdinalIgnoreCase);
+                    continue;
+                }
+
+                if (!inSection)
+                    continue;
+
+                int eq = line.IndexOf('=');
+                if (eq <= 0)
+                    continue;
+
+                string key = line.Substring(0, eq).Trim();
+                string val = line.Substring(eq + 1).Trim();
+                values[key] = val;
+            }
+
+            // 必需键校验：缺任一或模式无法解析视为无有效记录（容错损坏）
+            if (!values.TryGetValue(KeyMode, out string? modeStr) ||
+                !values.TryGetValue(KeyInputX, out string? inputX) ||
+                !values.TryGetValue(KeyInputY, out string? inputY))
+                return null;
+
+            if (!Enum.TryParse(modeStr, out ScalingMode mode))
+                return null;
+
+            // 文件名为可选追溯字段
+            values.TryGetValue(KeyFileName, out string? fileName);
+
+            return new ScalingRecord(mode, inputX, inputY, fileName);
+        }
+
+        /// <summary>
+        /// 写入涨缩记录，整体覆盖。自动创建目录。失败时抛出异常，由调用边界处理。
+        /// </summary>
+        public static void Save(ScalingMode mode, string inputX, string inputY, string fileName)
+        {
+            string path = GetIniPath();
+            string? dir = Path.GetDirectoryName(path);
+            if (!string.IsNullOrEmpty(dir))
+                Directory.CreateDirectory(dir);
+
+            var content =
+                $"[{SectionName}]\r\n" +
+                $"{KeyMode}={mode}\r\n" +
+                $"{KeyInputX}={inputX}\r\n" +
+                $"{KeyInputY}={inputY}\r\n" +
+                $"{KeyFileName}={fileName}\r\n";
+
+            // UTF-8 无 BOM（项目文件编码规范）
+            File.WriteAllText(path, content, new UTF8Encoding(false));
+        }
+    }
+
+    /// <summary>
+    /// 涨缩系数持久化记录（只读）。
+    /// </summary>
+    internal sealed class ScalingRecord
+    {
+        public ScalingMode Mode { get; }
+        public string InputX { get; }
+        public string InputY { get; }
+        public string? FileName { get; }
+
+        public ScalingRecord(ScalingMode mode, string inputX, string inputY, string? fileName)
+        {
+            Mode = mode;
+            InputX = inputX;
+            InputY = inputY;
+            FileName = fileName;
+        }
+    }
+}