diff --git a/Bin/net40/SunnyUI.Demo.exe b/Bin/net40/SunnyUI.Demo.exe
index cad65cec..c0cac7b5 100644
Binary files a/Bin/net40/SunnyUI.Demo.exe and b/Bin/net40/SunnyUI.Demo.exe differ
diff --git a/Bin/net40/SunnyUI.dll b/Bin/net40/SunnyUI.dll
index 9af15ae1..3b6c4525 100644
Binary files a/Bin/net40/SunnyUI.dll and b/Bin/net40/SunnyUI.dll differ
diff --git a/Bin/net45/SunnyUI.dll b/Bin/net45/SunnyUI.dll
index 255c9e5d..7aeb6cab 100644
Binary files a/Bin/net45/SunnyUI.dll and b/Bin/net45/SunnyUI.dll differ
diff --git a/Bin/net5.0-windows/SunnyUI.dll b/Bin/net5.0-windows/SunnyUI.dll
index f3442d8b..f1b7b3a5 100644
Binary files a/Bin/net5.0-windows/SunnyUI.dll and b/Bin/net5.0-windows/SunnyUI.dll differ
diff --git a/Bin/netcoreapp3.1/SunnyUI.dll b/Bin/netcoreapp3.1/SunnyUI.dll
index db95874c..d9218997 100644
Binary files a/Bin/netcoreapp3.1/SunnyUI.dll and b/Bin/netcoreapp3.1/SunnyUI.dll differ
diff --git a/SunnyUI.Demo/Charts/FBarChart.cs b/SunnyUI.Demo/Charts/FBarChart.cs
index 0d6a6745..8fea469a 100644
--- a/SunnyUI.Demo/Charts/FBarChart.cs
+++ b/SunnyUI.Demo/Charts/FBarChart.cs
@@ -26,26 +26,26 @@ namespace Sunny.UI.Demo
 
             var series = new UIBarSeries();
             series.Name = "Bar1";
-            series.AddData(-1);
-            series.AddData(-1);
-            series.AddData(-1);
-            series.AddData(-1);
-            series.AddData(-1);
-            series.AddData(1);
-            series.AddData(1);
-            series.AddData(1);
+            series.AddData(-1.1);
+            series.AddData(-1.1);
+            series.AddData(-1.1);
+            series.AddData(-1.1);
+            series.AddData(-1.1);
+            series.AddData(-1.1);
+            series.AddData(-1.1);
+            series.AddData(-1.1);
             option.Series.Add(series);
 
             series = new UIBarSeries();
             series.Name = "Bar2";
-            series.AddData(1.1);
-            series.AddData(1.1);
-            series.AddData(1.1);
-            series.AddData(1.1);
-            series.AddData(1.1);
-            series.AddData(1.1);
-            series.AddData(1.1);
-            series.AddData(1.1);
+            series.AddData(-1.1);
+            series.AddData(-1.1);
+            series.AddData(-1.1);
+            series.AddData(-1.1);
+            series.AddData(-1.1);
+            series.AddData(-1.1);
+            series.AddData(-1.1);
+            series.AddData(-1.1);
             option.Series.Add(series);
 
             option.XAxis.Data.Add("D1");
diff --git a/SunnyUI/Charts/UIBarChart.cs b/SunnyUI/Charts/UIBarChart.cs
index b865beb7..0c3fe1b6 100644
--- a/SunnyUI/Charts/UIBarChart.cs
+++ b/SunnyUI/Charts/UIBarChart.cs
@@ -139,16 +139,24 @@ namespace Sunny.UI
             if (!Option.YAxis.MaxAuto) max = Option.YAxis.Max;
             if (!Option.YAxis.MinAuto) min = Option.YAxis.Min;
 
-            if ((max - min).IsZero() && min.IsZero())
+            if ((max - min).IsZero())
             {
-                max = 100;
-                min = 0;
+                if (min.IsZero())
+                {
+                    max = 100;
+                    min = 0;
+                }
+                else if (max > 0)
+                {
+                    max = max * 2;
+                    min = 0;
+                }
+                else
+                {
+                    max = 0;
+                    min = min * 2;
+                }
             }
-            //else
-            //{
-            //    if (max > 0) min = 0;
-            //    else max = 0;
-            //}
 
             CalcDegreeScale(min, max, Option.YAxis.SplitNumber,
                 out int start, out int end, out double interval, out int decimalCount);
diff --git a/SunnyUI/Charts/UIBarChartEx.cs b/SunnyUI/Charts/UIBarChartEx.cs
index 81d25f1b..faa33798 100644
--- a/SunnyUI/Charts/UIBarChartEx.cs
+++ b/SunnyUI/Charts/UIBarChartEx.cs
@@ -67,15 +67,23 @@ namespace Sunny.UI
             if (!Option.YAxis.MaxAuto) max = Option.YAxis.Max;
             if (!Option.YAxis.MinAuto) min = Option.YAxis.Min;
 
-            if ((max - min).IsZero() && min.IsZero())
+            if ((max - min).IsZero())
             {
-                max = 100;
-                min = 0;
-            }
-            else
-            {
-                if (max > 0) min = 0;
-                else max = 0;
+                if (min.IsZero())
+                {
+                    max = 100;
+                    min = 0;
+                }
+                else if (max > 0)
+                {
+                    max = max * 2;
+                    min = 0;
+                }
+                else
+                {
+                    max = 0;
+                    min = min * 2;
+                }
             }
 
             CalcDegreeScale(min, max, Option.YAxis.SplitNumber,