diff --git a/Editor/MainComponents/RadarCoordEditor.cs b/Editor/MainComponents/RadarCoordEditor.cs
index 752ec816..2d5b9b40 100644
--- a/Editor/MainComponents/RadarCoordEditor.cs
+++ b/Editor/MainComponents/RadarCoordEditor.cs
@@ -24,7 +24,7 @@ namespace XCharts.Editor
             PropertyField("m_AxisName");
             PropertyField("m_SplitLine");
             PropertyField("m_SplitArea");
-            PropertyField("m_IndicatorList");
+            PropertyListField("m_IndicatorList");
             --EditorGUI.indentLevel;
         }
     }
diff --git a/Editor/Series/RadarEditor.cs b/Editor/Series/RadarEditor.cs
index aedf9832..969c7436 100644
--- a/Editor/Series/RadarEditor.cs
+++ b/Editor/Series/RadarEditor.cs
@@ -9,6 +9,7 @@ namespace XCharts.Editor
         {
             PropertyField("m_RadarType");
             PropertyField("m_RadarIndex");
+            PropertyField("m_Smooth");
 
             PropertyField("m_Symbol");
             PropertyField("m_LineStyle");
diff --git a/Runtime/Component/Axis/RadiusAxis/RadiusAxisHandler.cs b/Runtime/Component/Axis/RadiusAxis/RadiusAxisHandler.cs
index 630a0612..4e295923 100644
--- a/Runtime/Component/Axis/RadiusAxis/RadiusAxisHandler.cs
+++ b/Runtime/Component/Axis/RadiusAxis/RadiusAxisHandler.cs
@@ -32,7 +32,7 @@ namespace XCharts.Runtime
 
             if (!polar.context.isPointerEnter)
             {
-                axis.context.pointerValue = double.PositiveInfinity;
+                axis.context.pointerValue = double.NaN;
                 return;
             }
 
diff --git a/Runtime/Component/Tooltip/TooltipHandler.cs b/Runtime/Component/Tooltip/TooltipHandler.cs
index e06b11cc..67bac520 100644
--- a/Runtime/Component/Tooltip/TooltipHandler.cs
+++ b/Runtime/Component/Tooltip/TooltipHandler.cs
@@ -180,7 +180,7 @@ namespace XCharts.Runtime
         private void SetTooltipIndicatorLabel(Tooltip tooltip, Axis axis, ChartLabel label)
         {
             if (label == null) return;
-            if (double.IsPositiveInfinity(axis.context.pointerValue)) return;
+            if (double.IsNaN(axis.context.pointerValue)) return;
             label.SetActive(true);
             label.SetTextActive(true);
             label.SetPosition(axis.context.pointerLabelPosition);
diff --git a/Runtime/Internal/Attributes/SinceAttribute.cs b/Runtime/Internal/Attributes/SinceAttribute.cs
index 958d5ad2..1e3499e9 100644
--- a/Runtime/Internal/Attributes/SinceAttribute.cs
+++ b/Runtime/Internal/Attributes/SinceAttribute.cs
@@ -2,7 +2,7 @@ using System;
 
 namespace XCharts.Runtime
 {
-    [AttributeUsage(AttributeTargets.Field, AllowMultiple = false)]
+    [AttributeUsage(AttributeTargets.All, AllowMultiple = false)]
     public class Since : Attribute
     {
         public readonly string version;
diff --git a/Runtime/Serie/Parallel/ParallelHandler.cs b/Runtime/Serie/Parallel/ParallelHandler.cs
index 38a64534..c56c4d41 100644
--- a/Runtime/Serie/Parallel/ParallelHandler.cs
+++ b/Runtime/Serie/Parallel/ParallelHandler.cs
@@ -21,8 +21,7 @@ namespace XCharts.Runtime
             DrawParallelSerie(vh, serie);
         }
 
-        private void UpdateSerieContext()
-        { }
+        private void UpdateSerieContext() { }
 
         private void DrawParallelSerie(VertexHelper vh, Parallel serie)
         {
@@ -116,7 +115,10 @@ namespace XCharts.Runtime
                     lp = pos;
                 }
                 if (isSmooth)
-                    UGL.DrawCurves(vh, m_Points, lineWidth, lineColor, chart.settings.lineSmoothness, currProgress, isHorizonal);
+                    UGL.DrawCurves(vh, m_Points, lineWidth, lineColor,
+                        chart.settings.lineSmoothStyle,
+                        chart.settings.lineSmoothness,
+                        UGL.Direction.XAxis, currProgress, isHorizonal);
                 else
                     UGL.DrawLine(vh, m_Points, lineWidth, lineColor, isSmooth);
             }
diff --git a/Runtime/Serie/Radar/Radar.cs b/Runtime/Serie/Radar/Radar.cs
index 8af45a95..dc44ec02 100644
--- a/Runtime/Serie/Radar/Radar.cs
+++ b/Runtime/Serie/Radar/Radar.cs
@@ -11,9 +11,21 @@ namespace XCharts.Runtime
     [SerieDataExtraField()]
     public class Radar : Serie, INeedSerieContainer
     {
+        [SerializeField][Since("3.2.0")] private bool m_Smooth = false;
+
+        /// <summary>
+        /// Whether use smooth curve.
+        /// |是否平滑曲线。平滑曲线时不支持区域填充颜色。
+        /// </summary>
+        public bool smooth
+        {
+            get { return m_Smooth; }
+            set { if (PropertyUtil.SetStruct(ref m_Smooth, value)) { SetVerticesDirty(); } }
+        }
+
         public int containerIndex { get; internal set; }
         public int containterInstanceId { get; internal set; }
-        public override bool useDataNameForColor { get { return true; } }
+        public override bool useDataNameForColor { get { return radarType == RadarType.Multiple; } }
         public override bool multiDimensionLabel { get { return radarType == RadarType.Multiple; } }
 
         public static Serie AddDefaultSerie(BaseChart chart, string serieName)
diff --git a/Runtime/Serie/Radar/RadarHandler.cs b/Runtime/Serie/Radar/RadarHandler.cs
index 374455db..5bda0afb 100644
--- a/Runtime/Serie/Radar/RadarHandler.cs
+++ b/Runtime/Serie/Radar/RadarHandler.cs
@@ -262,11 +262,11 @@ namespace XCharts.Runtime
                     {
                         toPoint = new Vector3(centerPos.x + radius * Mathf.Sin(currAngle),
                             centerPos.y + radius * Mathf.Cos(currAngle));
-                        if (areaStyle != null && areaStyle.show)
+                        if (areaStyle != null && areaStyle.show && !serie.smooth)
                         {
                             UGL.DrawTriangle(vh, startPoint, toPoint, centerPos, areaColor, areaColor, areaToColor);
                         }
-                        if (lineStyle.show)
+                        if (lineStyle.show && !serie.smooth)
                         {
                             ChartDrawer.DrawLineStyle(vh, lineStyle.type, lineWidth, startPoint, toPoint, lineColor);
                         }
@@ -274,14 +274,24 @@ namespace XCharts.Runtime
                     }
                     serieData.context.dataPoints.Add(startPoint);
                 }
-                if (areaStyle != null && areaStyle.show)
+                if (areaStyle != null && areaStyle.show && !serie.smooth)
                 {
                     UGL.DrawTriangle(vh, startPoint, firstPoint, centerPos, areaColor, areaColor, areaToColor);
                 }
-                if (lineStyle.show)
+                if (lineStyle.show && !serie.smooth)
                 {
                     ChartDrawer.DrawLineStyle(vh, lineStyle.type, lineWidth, startPoint, firstPoint, lineColor);
                 }
+
+                if (serie.smooth)
+                {
+                    UGL.DrawCurves(vh, serieData.context.dataPoints, lineWidth, lineColor,
+                        chart.settings.lineSmoothStyle,
+                        chart.settings.lineSmoothness,
+                        UGL.Direction.Random,
+                        float.NaN, true);
+                }
+
                 if (symbol.show && symbol.type != SymbolType.None)
                 {
                     for (int m = 0; m < serieData.context.dataPoints.Count; m++)
@@ -394,11 +404,11 @@ namespace XCharts.Runtime
                 {
                     toPoint = new Vector3(p.x + radius * Mathf.Sin(currAngle),
                         p.y + radius * Mathf.Cos(currAngle));
-                    if (areaStyle != null && areaStyle.show)
+                    if (areaStyle != null && areaStyle.show && !serie.smooth)
                     {
                         UGL.DrawTriangle(vh, startPoint, toPoint, p, areaColor, areaColor, areaToColor);
                     }
-                    if (lineStyle.show)
+                    if (lineStyle.show && !serie.smooth)
                     {
                         if (radar.connectCenter)
                             ChartDrawer.DrawLineStyle(vh, lineStyle, startPoint, centerPos,
@@ -409,14 +419,15 @@ namespace XCharts.Runtime
                     startPoint = toPoint;
                     lastColor = lineColor;
                 }
+                serie.context.dataPoints.Add(startPoint);
                 serieData.context.position = startPoint;
                 serieData.context.labelPosition = startPoint;
 
-                if (areaStyle != null && areaStyle.show && j == endIndex)
+                if (areaStyle != null && areaStyle.show && j == endIndex && !serie.smooth)
                 {
                     UGL.DrawTriangle(vh, startPoint, firstPoint, centerPos, areaColor, areaColor, areaToColor);
                 }
-                if (lineStyle.show && j == endIndex)
+                if (lineStyle.show && j == endIndex && !serie.smooth)
                 {
                     if (radar.connectCenter)
                         ChartDrawer.DrawLineStyle(vh, lineStyle, startPoint, centerPos,
@@ -425,6 +436,16 @@ namespace XCharts.Runtime
                         LineStyle.Type.Solid, lineColor, radar.lineGradient ? firstColor : lineColor);
                 }
             }
+            if (serie.smooth)
+            {
+                var lineWidth = serie.lineStyle.GetWidth(chart.theme.serie.lineWidth);
+                var lineColor = SerieHelper.GetLineColor(serie, null, chart.theme, serie.context.colorIndex, false);
+                UGL.DrawCurves(vh, serie.context.dataPoints, lineWidth, lineColor,
+                    chart.settings.lineSmoothStyle,
+                    chart.settings.lineSmoothness,
+                    UGL.Direction.Random,
+                    float.NaN, true);
+            }
             if (serie.symbol.show && serie.symbol.type != SymbolType.None)
             {
                 for (int j = 0; j < serie.data.Count; j++)
diff --git a/Runtime/XUGL/UGL.cs b/Runtime/XUGL/UGL.cs
index b260a52e..595342f3 100644
--- a/Runtime/XUGL/UGL.cs
+++ b/Runtime/XUGL/UGL.cs
@@ -10,6 +10,24 @@ namespace XUGL
     /// </summary>
     public static class UGL
     {
+        /// <summary>
+        /// 曲线方向
+        /// </summary>
+        public enum Direction
+        {
+            /// <summary>
+            /// 沿X轴方向
+            /// </summary>
+            XAxis,
+            /// <summary>
+            /// 沿Y轴方向
+            /// </summary>
+            YAxis,
+            /// <summary>
+            /// 随机无序的。如一个闭合的环状曲线。
+            /// </summary>
+            Random
+        }
         private static readonly Color32 s_ClearColor32 = new Color32(0, 0, 0, 0);
         private static readonly Vector2 s_ZeroVector2 = Vector2.zero;
         private static UIVertex[] s_Vertex = new UIVertex[4];
@@ -134,7 +152,7 @@ namespace XUGL
             }
             else if (smooth)
             {
-                DrawCurves(vh, points, width, color, 2);
+                DrawCurves(vh, points, width, color, 2, 2, Direction.XAxis, float.NaN, closepath);
             }
             else
             {
@@ -1752,42 +1770,67 @@ namespace XUGL
         /// <param name="lineWidth">曲线宽</param>
         /// <param name="lineColor">曲线颜色</param>
         public static void DrawCurves(VertexHelper vh, Vector3 sp, Vector3 ep, Vector3 cp1, Vector3 cp2,
-            float lineWidth, Color32 lineColor, float smoothness)
+            float lineWidth, Color32 lineColor, float smoothness, Direction dire = Direction.XAxis)
         {
             var dist = Vector3.Distance(sp, ep);
             var segment = (int) (dist / (smoothness <= 0 ? 2f : smoothness));
             UGLHelper.GetBezierList2(ref s_CurvesPosList, sp, ep, segment, cp1, cp2);
-            DrawCurvesInternal(vh, s_CurvesPosList, lineWidth, lineColor);
+            DrawCurvesInternal(vh, s_CurvesPosList, lineWidth, lineColor, dire);
         }
 
+        /// <summary>
+        /// 画贝塞尔曲线
+        /// </summary>
+        /// <param name="vh"></param>
+        /// <param name="points">坐标点列表</param>
+        /// <param name="width">曲线宽</param>
+        /// <param name="color">曲线颜色</param>
+        /// <param name="smoothStyle">曲线样式</param>
+        /// <param name="smoothness">平滑度</param>
+        /// <param name="dire">曲线方向</param>
+        /// <param name="currProgress">当前绘制进度</param>
+        /// <param name="closed">曲线是否闭合</param>
         public static void DrawCurves(VertexHelper vh, List<Vector3> points, float width, Color32 color,
-            float smoothness, float currProgress = float.PositiveInfinity, bool isYAxis = false)
+            float smoothStyle, float smoothness, Direction dire, float currProgress = float.NaN,
+            bool closed = false)
         {
-            for (int i = 0; i < points.Count - 1; i++)
+            var count = points.Count;
+            var size = (closed?count : count - 1);
+            if (closed)
+                dire = Direction.Random;
+            for (int i = 0; i < size; i++)
             {
                 var sp = points[i];
-                var ep = points[i + 1];
-                var lsp = i > 0 ? points[i - 1] : sp;
-                var nep = i < points.Count - 2 ? points[i + 2] : ep;
+                var ep = closed?(i == size - 1 ? points[0] : points[i + 1]) : points[i + 1];
+                var lsp = i > 0 ? points[i - 1] : (closed?points[count - 1] : sp);
+                var nep = i < points.Count - 2 ? points[i + 2] : (closed?points[(i + 2) % count] : ep);
                 var smoothness2 = smoothness;
-                if (currProgress != float.PositiveInfinity)
+                if (currProgress != float.NaN)
                 {
-                    if (isYAxis)
-                        smoothness2 = ep.y <= currProgress ? smoothness : smoothness * 0.5f;
-                    else
-                        smoothness2 = ep.x <= currProgress ? smoothness : smoothness * 0.5f;
+                    switch (dire)
+                    {
+                        case Direction.XAxis:
+                            smoothness2 = ep.x <= currProgress ? smoothness : smoothness * 0.5f;
+                            break;
+                        case Direction.YAxis:
+                            smoothness2 = ep.y <= currProgress ? smoothness : smoothness * 0.5f;
+                            break;
+                        case Direction.Random:
+                            smoothness2 = smoothness * 0.5f;
+                            break;
+                    }
                 }
-                if (isYAxis)
-                    UGLHelper.GetBezierListVertical(ref s_CurvesPosList, sp, ep, smoothness2);
+                if (dire == Direction.YAxis)
+                    UGLHelper.GetBezierListVertical(ref s_CurvesPosList, sp, ep, smoothness2, smoothStyle);
                 else
-                    UGLHelper.GetBezierList(ref s_CurvesPosList, sp, ep, lsp, nep, smoothness2);
+                    UGLHelper.GetBezierList(ref s_CurvesPosList, sp, ep, lsp, nep, smoothness2, smoothStyle);
 
-                DrawCurvesInternal(vh, s_CurvesPosList, width, color, currProgress, isYAxis);
+                DrawCurvesInternal(vh, s_CurvesPosList, width, color, dire, currProgress);
             }
         }
 
         private static void DrawCurvesInternal(VertexHelper vh, List<Vector3> curvesPosList, float lineWidth,
-            Color32 lineColor, float currProgress = float.PositiveInfinity, bool isYAxis = false)
+            Color32 lineColor, Direction dire, float currProgress = float.NaN)
         {
             if (curvesPosList.Count > 1)
             {
@@ -1805,11 +1848,11 @@ namespace XUGL
                 for (int i = 1; i < curvesPosList.Count; i++)
                 {
                     to = curvesPosList[i];
-                    if (currProgress != float.PositiveInfinity)
+                    if (currProgress != float.NaN)
                     {
-                        if (isYAxis && to.y > currProgress)
+                        if (dire == Direction.YAxis && to.y > currProgress)
                             break;
-                        if (!isYAxis && to.x > currProgress)
+                        if (dire == Direction.XAxis && to.x > currProgress)
                             break;
                     }
 
diff --git a/Runtime/XUGL/UGLHelper.cs b/Runtime/XUGL/UGLHelper.cs
index 2f7166cb..4076b525 100644
--- a/Runtime/XUGL/UGLHelper.cs
+++ b/Runtime/XUGL/UGLHelper.cs
@@ -110,22 +110,21 @@ namespace XUGL
         public static void GetBezierList(ref List<Vector3> posList, Vector3 sp, Vector3 ep,
             Vector3 lsp, Vector3 nep, float smoothness = 2f, float k = 2.0f, bool limit = false)
         {
-            float dist = Mathf.Abs(sp.x - ep.x);
+            var dist = Vector3.Distance(sp, ep);
             Vector3 cp1, cp2;
             var dir = (ep - sp).normalized;
             var diff = dist / k;
             if (lsp == sp)
             {
-                cp1 = sp + dist / k * dir * 1;
-                cp1.y = sp.y;
-                cp1 = sp;
+                cp1 = sp + (nep - ep).normalized * diff;
+                if (limit)
+                    cp1.y = sp.y;
             }
             else
             {
                 cp1 = sp + (ep - lsp).normalized * diff;
                 if (limit)
                     cp1.y = sp.y;
-
             }
             if (nep == ep)
             {
@@ -137,7 +136,6 @@ namespace XUGL
                 if (limit)
                     cp2.y = ep.y;
             }
-            dist = Vector3.Distance(sp, ep);
             int segment = (int) (dist / (smoothness <= 0 ? 2f : smoothness));
             if (segment < 1) segment = (int) (dist / 0.5f);
             if (segment < 4) segment = 4;