diff --git a/Assets/XCharts/CHANGELOG-EN.md b/Assets/XCharts/CHANGELOG-EN.md
index 3143d7be..055bdc75 100644
--- a/Assets/XCharts/CHANGELOG-EN.md
+++ b/Assets/XCharts/CHANGELOG-EN.md
@@ -1,6 +1,7 @@
 
 # 更新日志
 
+* (2020.09.22) Fixed `PieChart` inconsistent border size
 * (2020.09.18) Added `Remove All Chart Object` to Remove All child nodes under the Chart (automatically reinitialized)
 * (2020.09.18) Fixed `SerieLabel` also displayed after hided `Serie` by clicked the legend #94
 * (2020.09.18) Optimize coordinate axis calibration and text display #93
diff --git a/Assets/XCharts/CHANGELOG.md b/Assets/XCharts/CHANGELOG.md
index 86036ff7..3bc182bd 100644
--- a/Assets/XCharts/CHANGELOG.md
+++ b/Assets/XCharts/CHANGELOG.md
@@ -1,6 +1,7 @@
 
 # 更新日志
 
+* (2020.09.22) 修复`PieChart`边框大小不一致的问题
 * (2020.09.19) 发布`v1.6.1`版本
 * (2020.09.19) 增加`Remove All Chart Object`移除图表下的所有子节点（会自动重新初始化）
 * (2020.09.18) 修复`SerieLabel`在点击图例隐藏`Serie`后还显示的问题#94
diff --git a/Assets/XCharts/Runtime/Internal/Utility/ChartDrawer.cs b/Assets/XCharts/Runtime/Internal/Utility/ChartDrawer.cs
index 4a669de3..936f0cb7 100644
--- a/Assets/XCharts/Runtime/Internal/Utility/ChartDrawer.cs
+++ b/Assets/XCharts/Runtime/Internal/Utility/ChartDrawer.cs
@@ -865,6 +865,7 @@ namespace XCharts
             var lastColor = color;
             var needBorder = borderWidth != 0;
             var needSpace = space != 0;
+            var borderLineWidth = needSpace ? borderWidth : borderWidth / 2;
             var lastPos = Vector3.zero;
             var middleDire = ChartHelper.GetDire(startAngle + halfAngle);
             if (needBorder || needSpace)
@@ -884,9 +885,9 @@ namespace XCharts
                 }
                 if (needBorder)
                 {
-                    borderDiff = borderWidth / Mathf.Sin(halfAngle);
+                    borderDiff = borderLineWidth / Mathf.Sin(halfAngle);
                     realCenter += borderDiff * middleDire;
-                    borderAngle = 2 * Mathf.Asin(borderWidth / (2 * radius));
+                    borderAngle = 2 * Mathf.Asin(borderLineWidth / (2 * radius));
                     realStartAngle = realStartAngle + borderAngle;
                     realToAngle = realToAngle - borderAngle;
                     if (realToAngle < realStartAngle)
@@ -963,8 +964,6 @@ namespace XCharts
             }
         }
 
-
-
         public static void DrawRoundCap(VertexHelper vh, Vector3 center, float width, float radius, float angle,
             bool clockwise, Color32 color, bool end)
         {