diff --git a/CHANGELOG.md b/CHANGELOG.md
index 30e9f5ab..25fc11a5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -69,6 +69,7 @@
 
 ### 日志详情
 
+* (2022.08.15) 优化`Smooth`贝塞尔曲线算法
 * (2022.08.13) 修复`DataZoom`组件开启时图表显示效果可能不正确的问题
 * (2022.08.11) 优化`Tooltip`支持`ignoreDataDefaultContent`
 * (2022.08.10) 修复`Chart`在3D相机下部分组件显示异常的问题
diff --git a/Runtime/XUGL/UGL.cs b/Runtime/XUGL/UGL.cs
index a5520086..d673ef19 100644
--- a/Runtime/XUGL/UGL.cs
+++ b/Runtime/XUGL/UGL.cs
@@ -1823,7 +1823,7 @@ namespace XUGL
                 if (dire == Direction.YAxis)
                     UGLHelper.GetBezierListVertical(ref s_CurvesPosList, sp, ep, smoothness2, smoothStyle);
                 else
-                    UGLHelper.GetBezierList(ref s_CurvesPosList, sp, ep, lsp, nep, smoothness2, smoothStyle);
+                    UGLHelper.GetBezierList(ref s_CurvesPosList, sp, ep, lsp, nep, smoothness2, smoothStyle, false, dire == Direction.Random);
 
                 DrawCurvesInternal(vh, s_CurvesPosList, width, color, dire, currProgress);
             }
diff --git a/Runtime/XUGL/UGLHelper.cs b/Runtime/XUGL/UGLHelper.cs
index 4076b525..a16c831e 100644
--- a/Runtime/XUGL/UGLHelper.cs
+++ b/Runtime/XUGL/UGLHelper.cs
@@ -108,23 +108,21 @@ 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)
+            Vector3 lsp, Vector3 nep, float smoothness = 2f, float k = 2.0f, bool limit = false, bool randomDire = false)
         {
-            var dist = Vector3.Distance(sp, ep);
             Vector3 cp1, cp2;
+            var dist = Vector3.Distance(sp, ep);
             var dir = (ep - sp).normalized;
-            var diff = dist / k;
+            var diff = (randomDire ? dist : Mathf.Abs(sp.x - ep.x)) / k;
             if (lsp == sp)
             {
                 cp1 = sp + (nep - ep).normalized * diff;
-                if (limit)
-                    cp1.y = sp.y;
+                if (limit) cp1.y = sp.y;
             }
             else
             {
                 cp1 = sp + (ep - lsp).normalized * diff;
-                if (limit)
-                    cp1.y = sp.y;
+                if (limit) cp1.y = sp.y;
             }
             if (nep == ep)
             {
@@ -133,8 +131,7 @@ namespace XUGL
             else
             {
                 cp2 = ep - (nep - sp).normalized * diff;
-                if (limit)
-                    cp2.y = ep.y;
+                if (limit) cp2.y = ep.y;
             }
             int segment = (int) (dist / (smoothness <= 0 ? 2f : smoothness));
             if (segment < 1) segment = (int) (dist / 0.5f);