diff --git a/.gitignore b/.gitignore
index 0b8391a..a13a714 100644
--- a/.gitignore
+++ b/.gitignore
@@ -30,6 +30,7 @@ bld/
 lib/
 XP.ImageProcessing/
 ImageProcessing.sln
+ExternalLibraries/
 
 # 排除 Libs 目录中的 DLL 和 PDB 文件（但保留目录结构）
 XplorePlane/Libs/Hardware/*.dll
diff --git a/XP.ImageProcessing.RoiControl/Controls/PolygonRoiCanvas.xaml.cs b/XP.ImageProcessing.RoiControl/Controls/PolygonRoiCanvas.xaml.cs
index 134be77..a95274f 100644
--- a/XP.ImageProcessing.RoiControl/Controls/PolygonRoiCanvas.xaml.cs
+++ b/XP.ImageProcessing.RoiControl/Controls/PolygonRoiCanvas.xaml.cs
@@ -344,6 +344,7 @@ namespace XP.ImageProcessing.RoiControl.Controls
         private Canvas _measureOverlay;
         private readonly System.Collections.Generic.List<Models.MeasureGroup> _ppGroups = new();
         private readonly System.Collections.Generic.List<Models.PointToLineGroup> _ptlGroups = new();
+        private readonly System.Collections.Generic.List<Models.AngleGroup> _angleGroups = new();
 
         // 点点距临时状态
         private Ellipse _pendingDot;
@@ -355,10 +356,16 @@ namespace XP.ImageProcessing.RoiControl.Controls
         private Line _ptlTempLine;
         private Point? _ptlTempL1, _ptlTempL2;
 
+        // 角度测量临时状态
+        private int _angleClickCount;
+        private Ellipse _angleTempVDot, _angleTempADot;
+        private Line _angleTempLineA;
+        private Point? _angleTempV, _angleTempA;
+
         // 拖拽状态
         private Ellipse _mDraggingDot;
-        private object _mDraggingOwner; // MeasureGroup 或 PointToLineGroup
-        private string _mDraggingRole;  // "Dot1","Dot2","DotL1","DotL2","DotP"
+        private object _mDraggingOwner;
+        private string _mDraggingRole;
 
         private static void OnMeasureModeChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
         {
@@ -383,8 +390,11 @@ namespace XP.ImageProcessing.RoiControl.Controls
             if (_ptlTempDot1 != null) { _measureOverlay.Children.Remove(_ptlTempDot1); _ptlTempDot1 = null; }
             if (_ptlTempDot2 != null) { _measureOverlay.Children.Remove(_ptlTempDot2); _ptlTempDot2 = null; }
             if (_ptlTempLine != null) { _measureOverlay.Children.Remove(_ptlTempLine); _ptlTempLine = null; }
-            _ptlTempL1 = _ptlTempL2 = null;
-            _ptlClickCount = 0;
+            _ptlTempL1 = _ptlTempL2 = null; _ptlClickCount = 0;
+            if (_angleTempVDot != null) { _measureOverlay.Children.Remove(_angleTempVDot); _angleTempVDot = null; }
+            if (_angleTempADot != null) { _measureOverlay.Children.Remove(_angleTempADot); _angleTempADot = null; }
+            if (_angleTempLineA != null) { _measureOverlay.Children.Remove(_angleTempLineA); _angleTempLineA = null; }
+            _angleTempV = _angleTempA = null; _angleClickCount = 0;
         }
 
         private void EnsureMeasureOverlay()
@@ -399,16 +409,17 @@ namespace XP.ImageProcessing.RoiControl.Controls
         private void RemoveMeasureOverlay()
         {
             if (_measureOverlay != null) { mainCanvas.Children.Remove(_measureOverlay); _measureOverlay = null; }
-            _ppGroups.Clear();
-            _ptlGroups.Clear();
+            _ppGroups.Clear(); _ptlGroups.Clear(); _angleGroups.Clear();
             _pendingDot = null; _pendingPoint = null;
             _ptlTempDot1 = _ptlTempDot2 = null; _ptlTempLine = null;
             _ptlTempL1 = _ptlTempL2 = null; _ptlClickCount = 0;
+            _angleTempVDot = _angleTempADot = null; _angleTempLineA = null;
+            _angleTempV = _angleTempA = null; _angleClickCount = 0;
             _mDraggingDot = null; _mDraggingOwner = null;
         }
 
         public void ClearMeasurements() => RemoveMeasureOverlay();
-        public int MeasureCount => _ppGroups.Count + _ptlGroups.Count;
+        public int MeasureCount => _ppGroups.Count + _ptlGroups.Count + _angleGroups.Count;
 
         // ── 点击分发 ──
 
@@ -421,6 +432,8 @@ namespace XP.ImageProcessing.RoiControl.Controls
                 HandlePointDistanceClick(pos);
             else if (CurrentMeasureMode == Models.MeasureMode.PointToLine)
                 HandlePointToLineClick(pos);
+            else if (CurrentMeasureMode == Models.MeasureMode.Angle)
+                HandleAngleClick(pos);
         }
 
         // ── 点点距 ──
@@ -523,6 +536,65 @@ namespace XP.ImageProcessing.RoiControl.Controls
             return g;
         }
 
+        // ── 角度测量 ──
+
+        private void HandleAngleClick(Point pos)
+        {
+            _angleClickCount++;
+
+            if (_angleClickCount == 1)
+            {
+                _angleTempV = pos;
+                _angleTempVDot = CreateMDot(Brushes.Red);
+                _measureOverlay.Children.Add(_angleTempVDot);
+                SetDotPos(_angleTempVDot, pos);
+                RaiseMeasureStatusChanged($"角度测量 - 顶点: ({pos.X:F0}, {pos.Y:F0})，请点击射线端点A");
+            }
+            else if (_angleClickCount == 2)
+            {
+                _angleTempA = pos;
+                _angleTempADot = CreateMDot(Brushes.Orange);
+                _measureOverlay.Children.Add(_angleTempADot);
+                SetDotPos(_angleTempADot, pos);
+                _angleTempLineA = new Line { Stroke = Brushes.Lime, StrokeThickness = 1, IsHitTestVisible = false,
+                    X1 = _angleTempV.Value.X, Y1 = _angleTempV.Value.Y, X2 = pos.X, Y2 = pos.Y };
+                _measureOverlay.Children.Add(_angleTempLineA);
+                RaiseMeasureStatusChanged($"角度测量 - 射线A已定义，请点击射线端点B");
+            }
+            else if (_angleClickCount == 3)
+            {
+                var g = CreateAngleGroup(_angleTempV.Value, _angleTempA.Value, pos);
+                _angleGroups.Add(g);
+
+                // 移除临时元素
+                if (_angleTempVDot != null) _measureOverlay.Children.Remove(_angleTempVDot);
+                if (_angleTempADot != null) _measureOverlay.Children.Remove(_angleTempADot);
+                if (_angleTempLineA != null) _measureOverlay.Children.Remove(_angleTempLineA);
+                _angleTempVDot = _angleTempADot = null; _angleTempLineA = null;
+                _angleTempV = _angleTempA = null; _angleClickCount = 0;
+
+                RaiseMeasureCompleted(g.V, g.B, g.AngleDeg, MeasureCount, "Angle");
+                CurrentMeasureMode = Models.MeasureMode.None;
+            }
+        }
+
+        private Models.AngleGroup CreateAngleGroup(Point v, Point a, Point b)
+        {
+            var g = new Models.AngleGroup { V = v, A = a, B = b };
+            g.LineA = new Line { Stroke = Brushes.Lime, StrokeThickness = 1, IsHitTestVisible = false };
+            g.LineB = new Line { Stroke = Brushes.Lime, StrokeThickness = 1, IsHitTestVisible = false };
+            g.Arc = new Path { Stroke = Brushes.Yellow, StrokeThickness = 1.5, IsHitTestVisible = false };
+            g.Label = new TextBlock { Foreground = Brushes.Yellow, FontSize = 13, FontWeight = FontWeights.Bold, IsHitTestVisible = false };
+            g.DotV = CreateMDot(Brushes.Red);
+            g.DotA = CreateMDot(Brushes.Orange);
+            g.DotB = CreateMDot(Brushes.Cyan);
+            foreach (UIElement el in new UIElement[] { g.LineA, g.LineB, g.Arc, g.Label, g.DotV, g.DotA, g.DotB })
+                _measureOverlay.Children.Add(el);
+            SetDotPos(g.DotV, v); SetDotPos(g.DotA, a); SetDotPos(g.DotB, b);
+            g.UpdateVisuals();
+            return g;
+        }
+
         // ── 共用：圆点创建、定位、拖拽、删除 ──
 
         private Ellipse CreateMDot(Brush fill)
@@ -561,6 +633,16 @@ namespace XP.ImageProcessing.RoiControl.Controls
                     if (g.DotP == dot) { _mDraggingOwner = g; _mDraggingRole = "DotP"; break; }
                 }
             }
+            // 查找角度组
+            if (_mDraggingOwner == null)
+            {
+                foreach (var g in _angleGroups)
+                {
+                    if (g.DotV == dot) { _mDraggingOwner = g; _mDraggingRole = "DotV"; break; }
+                    if (g.DotA == dot) { _mDraggingOwner = g; _mDraggingRole = "DotA"; break; }
+                    if (g.DotB == dot) { _mDraggingOwner = g; _mDraggingRole = "DotB"; break; }
+                }
+            }
             if (_mDraggingOwner != null) { _mDraggingDot = dot; dot.CaptureMouse(); e.Handled = true; }
         }
 
@@ -586,6 +668,14 @@ namespace XP.ImageProcessing.RoiControl.Controls
                 var foot = ptlg.FootPoint;
                 RaiseMeasureCompleted(ptlg.P, foot, ptlg.Distance, MeasureCount, "PointToLine");
             }
+            else if (_mDraggingOwner is Models.AngleGroup ag)
+            {
+                if (_mDraggingRole == "DotV") ag.V = pos;
+                else if (_mDraggingRole == "DotA") ag.A = pos;
+                else if (_mDraggingRole == "DotB") ag.B = pos;
+                ag.UpdateVisuals();
+                RaiseMeasureCompleted(ag.V, ag.B, ag.AngleDeg, MeasureCount, "Angle");
+            }
             e.Handled = true;
         }
 
@@ -622,6 +712,18 @@ namespace XP.ImageProcessing.RoiControl.Controls
                     e.Handled = true; return;
                 }
             }
+            // 角度删除
+            foreach (var g in _angleGroups)
+            {
+                if (g.DotV == dot || g.DotA == dot || g.DotB == dot)
+                {
+                    foreach (var el in new UIElement[] { g.DotV, g.DotA, g.DotB, g.LineA, g.LineB, g.Arc, g.Label })
+                        _measureOverlay.Children.Remove(el);
+                    _angleGroups.Remove(g);
+                    RaiseMeasureStatusChanged($"已删除测量 | 剩余 {MeasureCount} 条");
+                    e.Handled = true; return;
+                }
+            }
         }
 
         // ── 事件 ──
diff --git a/XP.ImageProcessing.RoiControl/Models/AngleGroup.cs b/XP.ImageProcessing.RoiControl/Models/AngleGroup.cs
new file mode 100644
index 0000000..85a3077
--- /dev/null
+++ b/XP.ImageProcessing.RoiControl/Models/AngleGroup.cs
@@ -0,0 +1,86 @@
+using System;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Media;
+using System.Windows.Shapes;
+
+namespace XP.ImageProcessing.RoiControl.Models
+{
+    /// <summary>一次角度测量的所有视觉元素（顶点V + 射线端点A/B + 两条射线 + 弧线 + 标签）</summary>
+    public class AngleGroup
+    {
+        public Ellipse DotV { get; set; }   // 顶点
+        public Ellipse DotA { get; set; }   // 射线端点A
+        public Ellipse DotB { get; set; }   // 射线端点B
+        public Line LineA { get; set; }     // 射线VA
+        public Line LineB { get; set; }     // 射线VB
+        public Path Arc { get; set; }       // 角度弧线
+        public TextBlock Label { get; set; }
+        public Point V { get; set; }
+        public Point A { get; set; }
+        public Point B { get; set; }
+
+        public double AngleDeg
+        {
+            get
+            {
+                double vax = A.X - V.X, vay = A.Y - V.Y;
+                double vbx = B.X - V.X, vby = B.Y - V.Y;
+                double lenA = Math.Sqrt(vax * vax + vay * vay);
+                double lenB = Math.Sqrt(vbx * vbx + vby * vby);
+                if (lenA < 0.001 || lenB < 0.001) return 0;
+                double dot = vax * vbx + vay * vby;
+                double cos = Math.Clamp(dot / (lenA * lenB), -1.0, 1.0);
+                return Math.Acos(cos) * 180.0 / Math.PI;
+            }
+        }
+
+        public void UpdateVisuals()
+        {
+            // 射线
+            LineA.X1 = V.X; LineA.Y1 = V.Y; LineA.X2 = A.X; LineA.Y2 = A.Y;
+            LineA.Visibility = Visibility.Visible;
+            LineB.X1 = V.X; LineB.Y1 = V.Y; LineB.X2 = B.X; LineB.Y2 = B.Y;
+            LineB.Visibility = Visibility.Visible;
+
+            // 弧线
+            double vax = A.X - V.X, vay = A.Y - V.Y;
+            double vbx = B.X - V.X, vby = B.Y - V.Y;
+            double lenA = Math.Sqrt(vax * vax + vay * vay);
+            double lenB = Math.Sqrt(vbx * vbx + vby * vby);
+
+            if (lenA < 1 || lenB < 1) { Arc.Visibility = Visibility.Collapsed; return; }
+
+            double arcRadius = Math.Min(30, Math.Min(lenA, lenB) * 0.3);
+            if (arcRadius < 8) arcRadius = 8;
+
+            double angleARad = Math.Atan2(vay, vax);
+            double angleBRad = Math.Atan2(vby, vbx);
+            double cross = vax * vby - vay * vbx;
+            double angleDeg = AngleDeg;
+            bool isLargeArc = angleDeg > 180;
+            var sweepDir = cross >= 0 ? SweepDirection.Clockwise : SweepDirection.Counterclockwise;
+
+            var startPt = new Point(V.X + arcRadius * Math.Cos(angleARad), V.Y + arcRadius * Math.Sin(angleARad));
+            var endPt = new Point(V.X + arcRadius * Math.Cos(angleBRad), V.Y + arcRadius * Math.Sin(angleBRad));
+
+            var arcSeg = new ArcSegment(endPt, new Size(arcRadius, arcRadius), 0, isLargeArc, sweepDir, true);
+            var fig = new PathFigure(startPt, new[] { arcSeg }, false);
+            Arc.Data = new PathGeometry(new[] { fig });
+            Arc.Visibility = Visibility.Visible;
+
+            // 标签位置
+            double midAngle = (angleARad + angleBRad) / 2.0;
+            double testX = Math.Cos(midAngle), testY = Math.Sin(midAngle);
+            double testCross = vax * testY - vay * testX;
+            if ((cross >= 0 && testCross < 0) || (cross < 0 && testCross >= 0))
+                midAngle += Math.PI;
+
+            double labelDist = arcRadius + 16;
+            Label.Text = $"{angleDeg:F1}°";
+            Canvas.SetLeft(Label, V.X + labelDist * Math.Cos(midAngle) - 15);
+            Canvas.SetTop(Label, V.Y + labelDist * Math.Sin(midAngle) - 8);
+            Label.Visibility = Visibility.Visible;
+        }
+    }
+}
diff --git a/XP.ImageProcessing.RoiControl/Models/MeasureMode.cs b/XP.ImageProcessing.RoiControl/Models/MeasureMode.cs
index c21bce4..5de1d9d 100644
--- a/XP.ImageProcessing.RoiControl/Models/MeasureMode.cs
+++ b/XP.ImageProcessing.RoiControl/Models/MeasureMode.cs
@@ -4,6 +4,7 @@ namespace XP.ImageProcessing.RoiControl.Models
     {
         None,
         PointDistance,
-        PointToLine
+        PointToLine,
+        Angle
     }
 }
diff --git a/XplorePlane/ViewModels/Main/MainViewModel.cs b/XplorePlane/ViewModels/Main/MainViewModel.cs
index 0b3087c..1722de5 100644
--- a/XplorePlane/ViewModels/Main/MainViewModel.cs
+++ b/XplorePlane/ViewModels/Main/MainViewModel.cs
@@ -455,7 +455,7 @@ namespace XplorePlane.ViewModels
         private void ExecuteAngleMeasure()
         {
             _logger.Info("角度测量功能已触发");
-            // TODO: 实现角度测量逻辑
+            _eventAggregator.GetEvent<MeasurementToolEvent>().Publish(MeasurementToolMode.Angle);
         }
 
         private void ExecuteThroughHoleFillRateMeasure()
diff --git a/XplorePlane/Views/Main/ViewportPanelView.xaml.cs b/XplorePlane/Views/Main/ViewportPanelView.xaml.cs
index bd03651..9438a2f 100644
--- a/XplorePlane/Views/Main/ViewportPanelView.xaml.cs
+++ b/XplorePlane/Views/Main/ViewportPanelView.xaml.cs
@@ -25,9 +25,17 @@ namespace XplorePlane.Views
             {
                 if (e is MeasureCompletedEventArgs args && DataContext is ViewportPanelViewModel vm)
                 {
-                    vm.MeasurementResult = $"{args.Distance:F2} px";
-                    string typeLabel = args.MeasureType == "PointToLine" ? "点线距" : "点点距";
-                    vm.ImageInfo = $"{typeLabel}: {args.Distance:F2} px | ({args.P1.X:F0},{args.P1.Y:F0}) → ({args.P2.X:F0},{args.P2.Y:F0}) | 共 {args.TotalCount} 条测量";
+                    string typeLabel = args.MeasureType switch
+                    {
+                        "PointToLine" => "点线距",
+                        "Angle" => "角度",
+                        _ => "点点距"
+                    };
+                    string valueText = args.MeasureType == "Angle"
+                        ? $"{args.Distance:F2}°"
+                        : $"{args.Distance:F2} px";
+                    vm.MeasurementResult = valueText;
+                    vm.ImageInfo = $"{typeLabel}: {valueText} | 共 {args.TotalCount} 条测量";
                 }
             };
             RoiCanvas.MeasureStatusChanged += (s, e) =>
@@ -52,6 +60,7 @@ namespace XplorePlane.Views
                     {
                         MeasurementToolMode.PointDistance => XP.ImageProcessing.RoiControl.Models.MeasureMode.PointDistance,
                         MeasurementToolMode.PointLineDistance => XP.ImageProcessing.RoiControl.Models.MeasureMode.PointToLine,
+                        MeasurementToolMode.Angle => XP.ImageProcessing.RoiControl.Models.MeasureMode.Angle,
                         _ => XP.ImageProcessing.RoiControl.Models.MeasureMode.None
                     };
                 }, Prism.Events.ThreadOption.UIThread);