diff --git a/osu.Game.Rulesets.Karaoke.Tests/Utils/NoteUtilsTest.cs b/osu.Game.Rulesets.Karaoke.Tests/Utils/NoteUtilsTest.cs
index e3af176b0..cdd228694 100644
--- a/osu.Game.Rulesets.Karaoke.Tests/Utils/NoteUtilsTest.cs
+++ b/osu.Game.Rulesets.Karaoke.Tests/Utils/NoteUtilsTest.cs
@@ -68,11 +68,11 @@ public void TestSeparateNoteTime(double[] time, double percentage, double[] firs
         }
 
         [Test]
-        public void TestSeparateLyricOtherPtoperty()
+        public void TestSeparateNoteOtherProperty()
         {
+            const double percentage = 0.3;
             var lyric = new Lyric();
 
-            const double percentage = 0.3;
             var note = new Note
             {
                 StartTime = 1000,
@@ -80,7 +80,7 @@ public void TestSeparateLyricOtherPtoperty()
                 StartIndex = 1,
                 EndIndex = 2,
                 Text = "ka",
-                Singers = new int[] { 0 },
+                Singers = new[] { 0 },
                 Display = false,
                 Tone = new Tone(-1, true),
                 ParentLyric = lyric
@@ -112,5 +112,38 @@ static void testRemainProperty(Note expect, Note actual)
                 Assert.AreEqual(expect.ParentLyric, actual.ParentLyric);
             }
         }
+
+        [TestCase(new double[] { 1000, 1000 }, new double[] { 2000, 4000 }, new double[] { 1000, 5000 })]
+        [TestCase(new double[] { 1000, 2500 }, new double[] { 3500, 2500 }, new double[] { 1000, 5000 })]
+        [TestCase(new double[] { 1000, 0 }, new double[] { 1000, 0 }, new double[] { 1000, 0 })] // it's ok to combine if duration is 0.
+        public void TestCombineNoteTime(double[] firstTime, double[] secondTime, double[] actualTime)
+        {
+            const int start_index = 3;
+            const int end_index = 5;
+
+            var lyric = new Lyric();
+
+            var firstNote = new Note
+            {
+                StartIndex = start_index,
+                EndIndex = end_index,
+                ParentLyric = lyric,
+                StartTime = firstTime[0],
+                Duration = firstTime[1],
+            };
+
+            var secondNote = new Note
+            {
+                StartIndex = start_index,
+                EndIndex = end_index,
+                ParentLyric = lyric,
+                StartTime = secondTime[0],
+                Duration = secondTime[1],
+            };
+
+            var combineNote = NoteUtils.CombineNote(firstNote, secondNote);
+            Assert.AreEqual(combineNote.StartTime, actualTime[0]);
+            Assert.AreEqual(combineNote.Duration, actualTime[1]);
+        }
     }
 }
diff --git a/osu.Game.Rulesets.Karaoke/Objects/Note.cs b/osu.Game.Rulesets.Karaoke/Objects/Note.cs
index 024ef59b7..1d7bd3fc5 100644
--- a/osu.Game.Rulesets.Karaoke/Objects/Note.cs
+++ b/osu.Game.Rulesets.Karaoke/Objects/Note.cs
@@ -1,7 +1,6 @@
 // Copyright (c) andy840119 <andy840119@gmail.com>. Licensed under the GPL Licence.
 // See the LICENCE file in the repository root for full licence text.
 
-using System;
 using Newtonsoft.Json;
 using osu.Framework.Bindables;
 using osu.Game.Rulesets.Judgements;
diff --git a/osu.Game.Rulesets.Karaoke/Utils/NoteUtils.cs b/osu.Game.Rulesets.Karaoke/Utils/NoteUtils.cs
index caa3ae59f..f9a7c93e4 100644
--- a/osu.Game.Rulesets.Karaoke/Utils/NoteUtils.cs
+++ b/osu.Game.Rulesets.Karaoke/Utils/NoteUtils.cs
@@ -8,7 +8,7 @@ namespace osu.Game.Rulesets.Karaoke.Utils
 {
     public static class NoteUtils
     {
-        public static Note SliceNote(Note note, double startPercentage,  double durationPercentage)
+        public static Note SliceNote(Note note, double startPercentage, double durationPercentage)
         {
             if (startPercentage < 0 || startPercentage + durationPercentage > 1)
                 throw new ArgumentOutOfRangeException($"{nameof(Note)} cannot assign split range of start from {startPercentage} and duration {durationPercentage}");
@@ -18,6 +18,7 @@ public static Note SliceNote(Note note, double startPercentage,  double duration
 
             return copyByTime(note, startTime, duration);
         }
+
         public static Tuple<Note, Note> SplitNote(Note note, double percentage = 0.5)
         {
             if (percentage < 0 || percentage > 1)
@@ -38,25 +39,37 @@ public static Tuple<Note, Note> SplitNote(Note note, double percentage = 0.5)
             return new Tuple<Note, Note>(firstNote, secondNote);
         }
 
-        private static Note copyByTime(Note oritinNote, double startTime, double duration)
+        public static Note CombineNote(Note firstLyric, Note secondLyric)
+        {
+            if (firstLyric.ParentLyric != secondLyric.ParentLyric)
+                throw new InvalidOperationException($"{nameof(firstLyric.ParentLyric)} and {nameof(secondLyric.ParentLyric)} should be same.");
+
+            if (firstLyric.StartIndex != secondLyric.StartIndex)
+                throw new InvalidOperationException($"{nameof(firstLyric.StartIndex)} and {nameof(secondLyric.StartIndex)} should be same.");
+
+            if (firstLyric.EndIndex != secondLyric.EndIndex)
+                throw new InvalidOperationException($"{nameof(firstLyric.EndIndex)} and {nameof(secondLyric.EndIndex)} should be same.");
+
+            var startTime = Math.Min(firstLyric.StartTime, secondLyric.StartTime);
+            var endTime = Math.Max(firstLyric.EndTime, secondLyric.EndTime);
+
+            return copyByTime(firstLyric, startTime, endTime - startTime);
+        }
+
+        private static Note copyByTime(Note originNote, double startTime, double duration)
         {
             return new Note
             {
                 StartTime = startTime,
                 Duration = duration,
-                StartIndex = oritinNote.StartIndex,
-                EndIndex = oritinNote.EndIndex,
-                Text = oritinNote.Text,
-                Singers = oritinNote.Singers?.Clone() as int[],
-                Display = oritinNote.Display,
-                Tone = oritinNote.Tone,
-                ParentLyric = oritinNote.ParentLyric
+                StartIndex = originNote.StartIndex,
+                EndIndex = originNote.EndIndex,
+                Text = originNote.Text,
+                Singers = originNote.Singers?.Clone() as int[],
+                Display = originNote.Display,
+                Tone = originNote.Tone,
+                ParentLyric = originNote.ParentLyric
             };
         }
-
-        public static Note CombineNote(Note firstLyric, Note secondLyric)
-        {
-            return null;
-        }
     }
 }