diff --git a/SunnyUI.Demo/Controls/FListBox.cs b/SunnyUI.Demo/Controls/FListBox.cs
index b84ea93b..173c71ab 100644
--- a/SunnyUI.Demo/Controls/FListBox.cs
+++ b/SunnyUI.Demo/Controls/FListBox.cs
@@ -13,7 +13,7 @@ namespace Sunny.UI.Demo
         public override void Init()
         {
             uiListBox1.Items.Clear();
-            for (int i = 0; i < 20; i++)
+            for (int i = 0; i < 50; i++)
             {
                 uiListBox1.Items.Add(i);
             }
diff --git a/SunnyUI/Controls/UIListBox.cs b/SunnyUI/Controls/UIListBox.cs
index 63b57ced..9fb89305 100644
--- a/SunnyUI/Controls/UIListBox.cs
+++ b/SunnyUI/Controls/UIListBox.cs
@@ -395,13 +395,16 @@ namespace Sunny.UI
             if (Bar != null && Bar.Visible)
             {
                 var si = ScrollBarInfo.GetInfo(Handle);
+                int temp = Math.Abs(e.Delta / 120);
                 if (e.Delta > 10)
                 {
-                    ScrollBarInfo.SetScrollValue(Handle, (si.nPos - SystemInformation.MouseWheelScrollLines) >= si.nMin ? si.nPos - SystemInformation.MouseWheelScrollLines : 0);
+                    int nposnum = si.nPos - temp * SystemInformation.MouseWheelScrollLines;
+                    ScrollBarInfo.SetScrollValue(Handle, nposnum >= si.nMin ? nposnum : 0);
                 }
                 else if (e.Delta < -10)
                 {
-                    ScrollBarInfo.SetScrollValue(Handle, (si.nPos + SystemInformation.MouseWheelScrollLines) <= si.nMax ? (si.nPos + SystemInformation.MouseWheelScrollLines) : si.nMax);
+                    int nposnum = si.nPos + temp * SystemInformation.MouseWheelScrollLines;
+                    ScrollBarInfo.SetScrollValue(Handle, nposnum <= si.nMax ? nposnum : si.nMax);
                 }
             }