diff --git a/Assets/XCharts/Runtime/Component/Sub/AxisSplitLine.cs b/Assets/XCharts/Runtime/Component/Sub/AxisSplitLine.cs
index 7944f9b9..3944115a 100644
--- a/Assets/XCharts/Runtime/Component/Sub/AxisSplitLine.cs
+++ b/Assets/XCharts/Runtime/Component/Sub/AxisSplitLine.cs
@@ -86,7 +86,7 @@ namespace XCharts
             else
             {
                 var color = theme.axisSplitLineColor;
-                color.a *= (byte)(color.a * lineStyle.opacity);
+                color.a = (byte)(color.a * lineStyle.opacity);
                 return color;
             }
         }
diff --git a/Assets/XCharts/Runtime/Component/Sub/LineStyle.cs b/Assets/XCharts/Runtime/Component/Sub/LineStyle.cs
index bbf191d5..4334cf3a 100644
--- a/Assets/XCharts/Runtime/Component/Sub/LineStyle.cs
+++ b/Assets/XCharts/Runtime/Component/Sub/LineStyle.cs
@@ -160,7 +160,7 @@ namespace XCharts
         {
             if (m_Opacity == 1) return m_Color;
             var color = m_Color;
-            color.a *= (byte)(color.a * m_Opacity);
+            color.a = (byte)(color.a * m_Opacity);
             return color;
         }
 
@@ -186,7 +186,7 @@ namespace XCharts
             }
             if (m_Opacity != 1)
             {
-                color.a *= (byte)(color.a * m_Opacity);
+                color.a = (byte)(color.a * m_Opacity);
             }
             return color;
         }