diff --git a/TuneLab/Data/IMidiPart.cs b/TuneLab/Data/IMidiPart.cs
index 5c5337d..1adca87 100644
--- a/TuneLab/Data/IMidiPart.cs
+++ b/TuneLab/Data/IMidiPart.cs
@@ -342,6 +342,69 @@ public static void ClearParameters(this IMidiPart part, double start, double end
             automation.Clear(start, end, 5);
         }
     }
+    internal static MidiPartInfo MergePartInfos(MidiPartInfo[] SortedPartInfos)
+    {
+        double PosAxisTrans(PartInfo curPart, double pos)
+        {
+            var startPos = SortedPartInfos[0].Pos;
+            var absPos = pos + curPart.Pos;
+            return absPos - startPos;
+        }
+        var ret = new MidiPartInfo();
+        var basePart = SortedPartInfos[0];
+        ret.Pos = SortedPartInfos.First().Pos;
+        ret.Dur = SortedPartInfos.Last().Dur + SortedPartInfos.Last().Pos - ret.Pos;
+        ret.Voice = basePart.Voice;
+        ret.Gain = basePart.Gain;
+        ret.Name = basePart.Name;
+        ret.Properties = basePart.Properties;
+
+        for (int i = 0; i < SortedPartInfos.Length; i++)
+        {
+            var curPart = SortedPartInfos[i];
+            var curPartPos = PosAxisTrans(curPart, 0);
+            var nextPartPos = i + 1 < SortedPartInfos.Length ? PosAxisTrans(SortedPartInfos[i + 1], 0) : double.MaxValue;
+            foreach(var item in curPart.Notes)
+            {
+                item.Pos=PosAxisTrans(curPart,item.Pos);
+                if (item.Pos < curPartPos) continue;
+                if (item.Pos >= nextPartPos) break;
+                ret.Notes.Add(item);
+            }
+            foreach (var item in curPart.Vibratos)
+            {
+                item.Pos = PosAxisTrans(curPart, item.Pos);
+                if (item.Pos < curPartPos) continue;
+                if (item.Pos >= nextPartPos) break;
+                ret.Vibratos.Add(item);
+            }
+            foreach (var item in curPart.Pitch)
+            {
+                List<Base.Structures.Point> line= new List<Base.Structures.Point>();
+                foreach (var point in item)
+                {
+                    var X = PosAxisTrans(curPart, point.X);
+                    if (X < curPartPos) continue;
+                    if (X >= nextPartPos) break;
+                    line.Add(new Base.Structures.Point(X, point.Y));
+                }
+                ret.Pitch.Add(line);
+            }
+            foreach (var kvp in curPart.Automations)
+            {
+                if (!ret.Automations.ContainsKey(kvp.Key)) { ret.Automations.Add(kvp.Key, new AutomationInfo() { DefaultValue = kvp.Value.DefaultValue, Points = new List<Base.Structures.Point>() }); }
+
+                foreach (var point in kvp.Value.Points)
+                {
+                    var X = PosAxisTrans(curPart, point.X);
+                    if (X < curPartPos) continue;
+                    if (X >= nextPartPos) break;
+                    ret.Automations[kvp.Key].Points.Add(new Base.Structures.Point(X, point.Y));
+                }
+            }
+        }
+        return ret;
+    }
 
     public static MidiPartInfo RangeInfo(this IMidiPart part, double start, double end)
     {
diff --git a/TuneLab/UI/MainWindow/Editor/TrackWindow/TrackScrollView/TrackScrollViewOperation.cs b/TuneLab/UI/MainWindow/Editor/TrackWindow/TrackScrollView/TrackScrollViewOperation.cs
index 5c4a03f..b3fb545 100644
--- a/TuneLab/UI/MainWindow/Editor/TrackWindow/TrackScrollView/TrackScrollViewOperation.cs
+++ b/TuneLab/UI/MainWindow/Editor/TrackWindow/TrackScrollView/TrackScrollViewOperation.cs
@@ -163,6 +163,32 @@ protected override void OnMouseDown(MouseDownEventArgs e)
                                                 menu.Items.Add(menuItem);
                                             }
                                         }
+                                        {
+                                            var trackIndex = TrackVerticalAxis.GetPosition(e.Position.Y).TrackIndex;
+                                            var track = Project.Tracks[trackIndex];
+                                            if (part.IsSelected && track.Parts.Count(p => p.IsSelected) > 1)
+                                            {   
+                                                var partArray = track.Parts.OrderBy(p => p.StartTime).ToArray();
+                                                int partIndex = Array.FindIndex(partArray, p => p == part);
+                                                int prevIndex = partIndex;
+                                                int nextIndex = partIndex;
+                                                while (prevIndex > 0) { if (!partArray[prevIndex - 1].IsSelected || partArray[prevIndex - 1] is not MidiPart) break;prevIndex--; }
+                                                while (nextIndex < partArray.Length-1) { if (!partArray[nextIndex + 1].IsSelected || partArray[nextIndex+1] is not MidiPart) break; nextIndex++; }
+                                                if (nextIndex > prevIndex)
+                                                {
+                                                    var menuItem = new MenuItem().SetName("Merge".Tr(TC.Menu)).SetAction(() =>
+                                                    {
+                                                        var oldParts = partArray.Skip(prevIndex).Take(nextIndex - prevIndex + 1);
+                                                        var oldPartInfos = oldParts.Select(p=>(MidiPartInfo)p.GetInfo()).ToArray();
+                                                        var newPartInfo = IMidiPartExtension.MergePartInfos(oldPartInfos);
+                                                        foreach(var oldPart in oldParts) track.RemovePart(oldPart);
+                                                        track.InsertPart(track.CreatePart(newPartInfo));
+                                                        track.Commit();
+                                                    });
+                                                    menu.Items.Add(menuItem);
+                                                }
+                                            }
+                                        }
                                         {
                                             var menuItem = new MenuItem() { Header = "Set Voice".Tr(TC.Menu) };
                                             var allEngines = VoicesManager.GetAllVoiceEngines();