diff --git a/XP.ImageProcessing.RoiControl/Controls/PolygonRoiCanvas.xaml.cs b/XP.ImageProcessing.RoiControl/Controls/PolygonRoiCanvas.xaml.cs
index 716eede..28653c9 100644
--- a/XP.ImageProcessing.RoiControl/Controls/PolygonRoiCanvas.xaml.cs
+++ b/XP.ImageProcessing.RoiControl/Controls/PolygonRoiCanvas.xaml.cs
@@ -629,7 +629,9 @@ namespace XP.ImageProcessing.RoiControl.Controls
             g.FullLine = new Line { Stroke = Brushes.Red, StrokeThickness = 1, IsHitTestVisible = false };
             g.FillLine = new Line { Stroke = Brushes.Lime, StrokeThickness = 2, IsHitTestVisible = false };
 
-            g.Label = new TextBlock { FontSize = 13, FontWeight = FontWeights.Bold, IsHitTestVisible = false };
+            g.Label = new TextBlock { FontSize = 13, FontWeight = FontWeights.Bold, Cursor = Cursors.Hand };
+            g.Label.SetValue(ContextMenuService.IsEnabledProperty, false);
+            g.Label.MouseRightButtonUp += (s, ev) => { ShowTHTLimitEditor(g); ev.Handled = true; };
 
             g.DotE1 = CreateMDot(Brushes.DodgerBlue);
             g.DotE2 = CreateMDot(Brushes.Cyan);
@@ -851,6 +853,94 @@ namespace XP.ImageProcessing.RoiControl.Controls
             }
         }
 
+        // ── 填锡率阈值编辑 ──
+
+        private TextBox _thtEditBox;
+        private TextBlock _thtEditLabel;
+
+        private void RemoveTHTEditor()
+        {
+            if (_thtEditBox != null && _measureOverlay != null)
+                _measureOverlay.Children.Remove(_thtEditBox);
+            if (_thtEditLabel != null && _measureOverlay != null)
+                _measureOverlay.Children.Remove(_thtEditLabel);
+            _thtEditBox = null;
+            _thtEditLabel = null;
+        }
+
+        private void ShowTHTLimitEditor(Models.FillRateGroup g)
+        {
+            if (_measureOverlay == null) return;
+
+            // 移除旧的编辑框
+            if (_thtEditBox != null)
+            {
+                _measureOverlay.Children.Remove(_thtEditBox);
+                _thtEditBox = null;
+            }
+            if (_thtEditLabel != null)
+            {
+                _measureOverlay.Children.Remove(_thtEditLabel);
+                _thtEditLabel = null;
+            }
+
+            double left = Canvas.GetLeft(g.Label);
+            double top = Canvas.GetTop(g.Label) + 22;
+
+            // 参数名称提示
+            _thtEditLabel = new TextBlock
+            {
+                Text = "THTLimit(%):",
+                FontSize = 11,
+                Foreground = Brushes.White,
+                Background = new SolidColorBrush(Color.FromArgb(180, 0, 0, 0)),
+                Padding = new Thickness(3, 1, 3, 1)
+            };
+            Canvas.SetLeft(_thtEditLabel, left);
+            Canvas.SetTop(_thtEditLabel, top);
+            _measureOverlay.Children.Add(_thtEditLabel);
+
+            // 输入框
+            _thtEditBox = new TextBox
+            {
+                Text = g.THTLimit.ToString("F1"),
+                Width = 60,
+                Height = 22,
+                FontSize = 12,
+                Background = Brushes.White,
+                BorderBrush = Brushes.Orange,
+                BorderThickness = new Thickness(2),
+                Padding = new Thickness(2, 0, 2, 0)
+            };
+            Canvas.SetLeft(_thtEditBox, left + 80);
+            Canvas.SetTop(_thtEditBox, top);
+            _measureOverlay.Children.Add(_thtEditBox);
+            _thtEditBox.Focus();
+            _thtEditBox.SelectAll();
+
+            // 回车确认
+            _thtEditBox.KeyDown += (s, ev) =>
+            {
+                if (ev.Key == System.Windows.Input.Key.Enter)
+                {
+                    if (double.TryParse(_thtEditBox.Text, out double val))
+                    {
+                        g.THTLimit = System.Math.Clamp(val, 0, 100);
+                        g.UpdateVisuals();
+                        RaiseMeasureCompleted(g.E3, g.E4, g.FillRate, MeasureCount, "FillRate");
+                    }
+                    RemoveTHTEditor();
+                }
+                else if (ev.Key == System.Windows.Input.Key.Escape)
+                {
+                    RemoveTHTEditor();
+                }
+            };
+
+            // 失焦也关闭
+            _thtEditBox.LostFocus += (s, ev) => RemoveTHTEditor();
+        }
+
         // ── 事件 ──
 
         public static readonly RoutedEvent MeasureCompletedEvent =
diff --git a/XP.ImageProcessing.RoiControl/Models/FillRateGroup.cs b/XP.ImageProcessing.RoiControl/Models/FillRateGroup.cs
index 3b2d6b1..34e789c 100644
--- a/XP.ImageProcessing.RoiControl/Models/FillRateGroup.cs
+++ b/XP.ImageProcessing.RoiControl/Models/FillRateGroup.cs
@@ -100,7 +100,7 @@ namespace XP.ImageProcessing.RoiControl.Models
 
             double rate = FillRate;
             string cls = Classification;
-            Label.Text = $"{rate:F1}% {cls}";
+            Label.Text = $"Fill: {rate:F1}% | THTLimit: {THTLimit:F1}% | {cls}";
             Label.Foreground = cls == "PASS" ? Brushes.Lime : Brushes.Red;
             double labelX = Math.Max(Math.Max(E1.X, E2.X), Math.Max(E3.X, E4.X)) + 15;
             double labelY = (E1.Y + E2.Y) / 2;