diff --git a/SunnyUI/Charts/UILineChart.cs b/SunnyUI/Charts/UILineChart.cs
index 1a273fb6..f98f8b88 100644
--- a/SunnyUI/Charts/UILineChart.cs
+++ b/SunnyUI/Charts/UILineChart.cs
@@ -60,8 +60,11 @@
 using System;
 using System.Collections.Generic;
 using System.ComponentModel;
+using System.Drawing;
+using System.Drawing.Drawing2D;
 using System.Linq;
 using System.Text;
+using System.Windows.Forms;
 
 namespace Sunny.UI
 {