diff --git a/BeDesignerSCADA/Helper/SystemHelper.cs b/BeDesignerSCADA/Helper/SystemHelper.cs
index 45e9a2d7..b8466704 100644
--- a/BeDesignerSCADA/Helper/SystemHelper.cs
+++ b/BeDesignerSCADA/Helper/SystemHelper.cs
@@ -142,7 +142,6 @@ namespace BeDesignerSCADA.Helper
         private const int DBT_DEVICEREMOVECOMPLETE = 0x8004; //移除设备
         public const int DBT_DEVTYP_PORT = 0x00000003;
         public const int DBT_DEVTYP_VOLUME = 0x00000002;
-
         public IntPtr WndProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
         {
             if (msg == WM_DEVICECHANGE)
@@ -217,8 +216,6 @@ namespace BeDesignerSCADA.Helper
                 return drives[i];
             return nona;
         }
-
-
         #endregion
 
         /// <summary>
@@ -247,8 +244,6 @@ namespace BeDesignerSCADA.Helper
             scrollViewer.ScrollToHorizontalOffset(tarPos.X);
         }
 
-        private static Encoding gb2312 = Encoding.GetEncoding("GB2312");
-
         /// <summary>
         /// 汉字转全拼
         /// </summary>