diff --git a/demo/Ursa.Demo/Pages/IntroductionDemo.axaml b/demo/Ursa.Demo/Pages/IntroductionDemo.axaml
index 4ef5f7f..f06ee98 100644
--- a/demo/Ursa.Demo/Pages/IntroductionDemo.axaml
+++ b/demo/Ursa.Demo/Pages/IntroductionDemo.axaml
@@ -153,7 +153,7 @@
                             <u:TimelineItem
                                 Content="Step 2"
                                 Header="Start"
-                                Mode="Right"
+                                Position="Right"
                                 Type="Ongoing"
                                 Time="2024-01-04 22:32:58"/>
                             <u:TimelineItem
@@ -164,7 +164,7 @@
                             <u:TimelineItem
                                 Content="Step 4"
                                 Header="Finished"
-                                Mode="Right"
+                                Position="Right"
                                 Type="Success" 
                                 Time="2024-01-05 00:27:44"/>
                         </u:Timeline>
diff --git a/demo/Ursa.Demo/Pages/TimelineDemo.axaml b/demo/Ursa.Demo/Pages/TimelineDemo.axaml
index fcf8af2..262ac3e 100644
--- a/demo/Ursa.Demo/Pages/TimelineDemo.axaml
+++ b/demo/Ursa.Demo/Pages/TimelineDemo.axaml
@@ -59,27 +59,27 @@
             <u:TimelineItem
                 Content="Step 1"
                 Header="第一步"
-                Mode="Left"
+                Position="Left"
                 Type="Default" />
             <u:TimelineItem
                 Content="Step 2"
                 Header="第二步"
-                Mode="Right"
+                Position="Right"
                 Type="Success" />
             <u:TimelineItem
                 Content="Step 3"
                 Header="第三步"
-                Mode="Separate"
+                Position="Separate"
                 Type="Warning" />
             <u:TimelineItem
                 Content="Step 4"
                 Header="第四步"
-                Mode="Separate"
+                Position="Separate"
                 Type="Ongoing" />
             <u:TimelineItem
                 Content="Step 5"
                 Header="第五步"
-                Mode="Separate"
+                Position="Separate"
                 TimeFormat="yyyy-MM-dd"
                 Type="Error" />
         </u:Timeline>
diff --git a/src/Ursa/Controls/Timeline/Timeline.cs b/src/Ursa/Controls/Timeline/Timeline.cs
index 811911b..a318a58 100644
--- a/src/Ursa/Controls/Timeline/Timeline.cs
+++ b/src/Ursa/Controls/Timeline/Timeline.cs
@@ -176,21 +176,21 @@ public class Timeline: ItemsControl
             {
                 foreach (var item in items)
                 {
-                    SetIfUnset(item, TimelineItem.ModeProperty, TimelineItemDisplayMode.Left);
+                    SetIfUnset(item, TimelineItem.PositionProperty, TimelineItemPosition.Left);
                 }
             }
             else if (Mode == TimelineDisplayMode.Right)
             {
                 foreach (var item in items)
                 {
-                    SetIfUnset(item, TimelineItem.ModeProperty, TimelineItemDisplayMode.Right);
+                    SetIfUnset(item, TimelineItem.PositionProperty, TimelineItemPosition.Right);
                 }
             }
             else if (Mode == TimelineDisplayMode.Center)
             {
                 foreach (var item in items)
                 {
-                    SetIfUnset(item, TimelineItem.ModeProperty, TimelineItemDisplayMode.Separate);
+                    SetIfUnset(item, TimelineItem.PositionProperty, TimelineItemPosition.Separate);
                 }
             }
             else if (Mode == TimelineDisplayMode.Alternate)
@@ -200,11 +200,11 @@ public class Timeline: ItemsControl
                 {
                     if (left)
                     {
-                        SetIfUnset(item, TimelineItem.ModeProperty, TimelineItemDisplayMode.Left);
+                        SetIfUnset(item, TimelineItem.PositionProperty, TimelineItemPosition.Left);
                     }
                     else
                     {
-                        SetIfUnset(item, TimelineItem.ModeProperty, TimelineItemDisplayMode.Right);
+                        SetIfUnset(item, TimelineItem.PositionProperty, TimelineItemPosition.Right);
                     }
                     left = !left;
                 }
diff --git a/src/Ursa/Controls/Timeline/TimelineDisplayMode.cs b/src/Ursa/Controls/Timeline/TimelineDisplayMode.cs
index dcbad75..ec01a90 100644
--- a/src/Ursa/Controls/Timeline/TimelineDisplayMode.cs
+++ b/src/Ursa/Controls/Timeline/TimelineDisplayMode.cs
@@ -14,7 +14,7 @@ public enum TimelineDisplayMode
 /// Right means line is placed right to TimelineItem content.
 /// Separate means line is placed between TimelineItem content and time.
 /// </summary>
-public enum TimelineItemDisplayMode
+public enum TimelineItemPosition
 {
     Left,
     Right,
diff --git a/src/Ursa/Controls/Timeline/TimelineItem.cs b/src/Ursa/Controls/Timeline/TimelineItem.cs
index dcbae01..9eecece 100644
--- a/src/Ursa/Controls/Timeline/TimelineItem.cs
+++ b/src/Ursa/Controls/Timeline/TimelineItem.cs
@@ -62,13 +62,13 @@ public class TimelineItem: HeaderedContentControl
         set => SetValue(TypeProperty, value);
     }
 
-    public static readonly StyledProperty<TimelineItemDisplayMode> ModeProperty = AvaloniaProperty.Register<TimelineItem, TimelineItemDisplayMode>(
-        nameof(Mode), defaultValue: TimelineItemDisplayMode.Right);
+    public static readonly StyledProperty<TimelineItemPosition> PositionProperty = AvaloniaProperty.Register<TimelineItem, TimelineItemPosition>(
+        nameof(Position), defaultValue: TimelineItemPosition.Right);
 
-    public TimelineItemDisplayMode Mode
+    public TimelineItemPosition Position
     {
-        get => GetValue(ModeProperty);
-        set => SetValue(ModeProperty, value);
+        get => GetValue(PositionProperty);
+        set => SetValue(PositionProperty, value);
     }
     
     public static readonly DirectProperty<TimelineItem, double> LeftWidthProperty = AvaloniaProperty.RegisterDirect<TimelineItem, double>(
@@ -119,20 +119,20 @@ public class TimelineItem: HeaderedContentControl
     static TimelineItem()
     {
         IconProperty.Changed.AddClassHandler<TimelineItem, object?>((item, args) => { item.OnIconChanged(args); });
-        ModeProperty.Changed.AddClassHandler<TimelineItem, TimelineItemDisplayMode>((item, args) => { item.OnModeChanged(args); });
+        PositionProperty.Changed.AddClassHandler<TimelineItem, TimelineItemPosition>((item, args) => { item.OnModeChanged(args); });
         AffectsMeasure<TimelineItem>(LeftWidthProperty, RightWidthProperty, IconWidthProperty);
     }
 
-    private void OnModeChanged(AvaloniaPropertyChangedEventArgs<TimelineItemDisplayMode> args)
+    private void OnModeChanged(AvaloniaPropertyChangedEventArgs<TimelineItemPosition> args)
     {
         SetMode(args.NewValue.Value);
     }
 
-    private void SetMode(TimelineItemDisplayMode mode)
+    private void SetMode(TimelineItemPosition mode)
     {
-        PseudoClasses.Set(PC_AllLeft, mode == TimelineItemDisplayMode.Left);
-        PseudoClasses.Set(PC_AllRight, mode == TimelineItemDisplayMode.Right);
-        PseudoClasses.Set(PC_Separate, mode == TimelineItemDisplayMode.Separate);
+        PseudoClasses.Set(PC_AllLeft, mode == TimelineItemPosition.Left);
+        PseudoClasses.Set(PC_AllRight, mode == TimelineItemPosition.Right);
+        PseudoClasses.Set(PC_Separate, mode == TimelineItemPosition.Separate);
     }
 
     protected override void OnApplyTemplate(TemplateAppliedEventArgs e)
@@ -144,7 +144,7 @@ public class TimelineItem: HeaderedContentControl
         _contentPresenter = e.NameScope.Find<ContentPresenter>(PART_Content);
         _timePresenter = e.NameScope.Find<TextBlock>(PART_Time);
         PseudoClasses.Set(PC_EmptyIcon, Icon is null);
-        SetMode(Mode);
+        SetMode(Position);
     }
 
     private void OnIconChanged(AvaloniaPropertyChangedEventArgs<object?> args)
@@ -166,17 +166,17 @@ public class TimelineItem: HeaderedContentControl
         double content = _contentPresenter?.DesiredSize.Width ?? 0;
         double time = _timePresenter?.DesiredSize.Width ?? 0;
         double max = Math.Max(header, content);
-        if (Mode == TimelineItemDisplayMode.Left)
+        if (Position == TimelineItemPosition.Left)
         {
             max = Math.Max(max, time);
             return (0, icon, max);
         }
-        if (Mode == TimelineItemDisplayMode.Right)
+        if (Position == TimelineItemPosition.Right)
         {
             max = Math.Max(max, time);
             return (max    , icon, 0);
         }
-        if (Mode == TimelineItemDisplayMode.Separate)
+        if (Position == TimelineItemPosition.Separate)
         {
             return (time, icon, max);
         }