diff --git a/XP.ImageProcessing.RoiControl/Controls/PolygonRoiCanvas.xaml.cs b/XP.ImageProcessing.RoiControl/Controls/PolygonRoiCanvas.xaml.cs
index c3672a5..134be77 100644
--- a/XP.ImageProcessing.RoiControl/Controls/PolygonRoiCanvas.xaml.cs
+++ b/XP.ImageProcessing.RoiControl/Controls/PolygonRoiCanvas.xaml.cs
@@ -134,6 +134,10 @@ namespace XP.ImageProcessing.RoiControl.Controls
                 control.CanvasHeight = imageSource.Height;
                 control.ResetView();
             }
+
+            // 图像尺寸变化后刷新十字线
+            if (control.ShowCrosshair)
+                control.AddCrosshair();
         }
 
         public static readonly DependencyProperty ROIItemsProperty =