diff --git a/Windows/CS/Framework4.0/Toprie/Toprie/Setting.cs b/Windows/CS/Framework4.0/Toprie/Toprie/Setting.cs
index 4fff4f1..e8c4365 100644
--- a/Windows/CS/Framework4.0/Toprie/Toprie/Setting.cs
+++ b/Windows/CS/Framework4.0/Toprie/Toprie/Setting.cs
@@ -55,6 +55,8 @@ namespace JoyD.Windows.CS
         private int _currentBrushSize = 1; // 默认画笔大小为1像素
         // 温差图绘制相关变量
         private Point _lastDrawPoint = Point.Empty; // 上一个绘制点的位置
+        private bool _isDrawingRectangle = false; // 是否正在绘制矩形
+        private Point _rectangleStartPoint = Point.Empty; // 矩形起始点
         
         public Setting()
         {
@@ -599,6 +601,22 @@ namespace JoyD.Windows.CS
                 // 退出温差图绘制状态，返回到就绪状态
                 ExitTempDiffDrawingMode();
             }
+            // 温差图绘制模式下，按住Ctrl键并按下左键开始绘制矩形
+            else if (_isTempDiffDrawingMode && e.Button == MouseButtons.Left && (ModifierKeys & Keys.Control) == Keys.Control)
+            {
+                // 初始化温差层图像（如果不存在或尺寸不匹配）
+                if (_tempDiffOverlayImage == null || 
+                    _tempDiffOverlayImage.Width != picBoxTemp.Image.Width || 
+                    _tempDiffOverlayImage.Height != picBoxTemp.Image.Height)
+                {
+                    InitializeTempDiffOverlayImage();
+                }
+                
+                // 获取相对于图像的坐标作为矩形起始点
+                _rectangleStartPoint = ControlPointToImagePoint(e.Location);
+                _isDrawingRectangle = true;
+                return;
+            }
             // 检查是否处于绘制状态且右击鼠标
             else if (_isDrawingMode && e.Button == MouseButtons.Right)
             {
@@ -1189,8 +1207,52 @@ namespace JoyD.Windows.CS
                     catch {}
                 }
                 
-                // 如果按下鼠标左键，执行绘制操作
-                if (e.Button == MouseButtons.Left && picBoxTemp.Image != null)
+                // 处理矩形绘制（按住Ctrl键）
+                if (_isDrawingRectangle && e.Button == MouseButtons.Left && picBoxTemp.Image != null)
+                {
+                    // 获取相对于图像的当前坐标
+                    Point currentImagePoint = ControlPointToImagePoint(e.Location);
+                    
+                    // 创建临时位图用于双重缓冲，避免闪烁
+                    using (Bitmap tempBitmap = new Bitmap(_tempDiffOverlayImage))
+                    {
+                        using (Graphics g = Graphics.FromImage(tempBitmap))
+                        {
+                            g.SmoothingMode = SmoothingMode.AntiAlias;
+                            g.InterpolationMode = InterpolationMode.HighQualityBicubic;
+                            
+                            // 计算矩形参数
+                            int x = Math.Min(_rectangleStartPoint.X, currentImagePoint.X);
+                            int y = Math.Min(_rectangleStartPoint.Y, currentImagePoint.Y);
+                            int width = Math.Abs(currentImagePoint.X - _rectangleStartPoint.X);
+                            int height = Math.Abs(currentImagePoint.Y - _rectangleStartPoint.Y);
+                            Rectangle rect = new Rectangle(x, y, width, height);
+                            
+                            // 创建半透明的填充颜色
+                            Color fillColor = Color.FromArgb(128, selectedColor);
+                            
+                            // 绘制填充矩形
+                            g.FillRectangle(new SolidBrush(fillColor), rect);
+                            
+                            // 绘制矩形边框
+                            using (Pen pen = new Pen(selectedColor, _currentBrushSize))
+                            {
+                                g.DrawRectangle(pen, rect);
+                            }
+                        }
+                        
+                        // 将临时位图复制回温差层图像
+                        using (Graphics g = Graphics.FromImage(_tempDiffOverlayImage))
+                        {
+                            g.DrawImage(tempBitmap, 0, 0);
+                        }
+                    }
+                    
+                    // 触发重绘
+                    picBoxTemp.Invalidate();
+                }
+                // 普通绘制操作（未按住Ctrl键）
+                else if (e.Button == MouseButtons.Left && !_isDrawingRectangle && picBoxTemp.Image != null)
                 {
                     // 初始化温差层图像（如果不存在或尺寸不匹配）
                     if (_tempDiffOverlayImage == null || 
@@ -1519,10 +1581,16 @@ namespace JoyD.Windows.CS
         /// </summary>
         private void PicBoxTemp_MouseUp(object sender, MouseEventArgs e)
         {
-            // 在温差图绘制模式下，松开鼠标时重置上一个绘制点
+            // 在温差图绘制模式下，松开鼠标时重置绘制状态
             if (_isTempDiffDrawingMode)
             {
                 _lastDrawPoint = Point.Empty;
+                // 结束矩形绘制
+                if (_isDrawingRectangle)
+                {
+                    _isDrawingRectangle = false;
+                    _rectangleStartPoint = Point.Empty;
+                }
             }
             
             // 结束调整大小