diff --git a/Ink Canvas/MainWindow_cs/MW_BoardControls.cs b/Ink Canvas/MainWindow_cs/MW_BoardControls.cs
index 6fe5cce0..2cd3342d 100644
--- a/Ink Canvas/MainWindow_cs/MW_BoardControls.cs	
+++ b/Ink Canvas/MainWindow_cs/MW_BoardControls.cs	
@@ -96,7 +96,6 @@ namespace Ink_Canvas {
                                 InkCanvas.SetLeft(img, info.Left);
                                 InkCanvas.SetTop(img, info.Top);
                                 inkCanvas.Children.Add(img);
-                                CenterAndScaleElement(img);
                             }
                         }
                     }
diff --git a/Ink Canvas/MainWindow_cs/MW_ElementsControls.cs b/Ink Canvas/MainWindow_cs/MW_ElementsControls.cs
index b5d61c7e..a2dfe888 100644
--- a/Ink Canvas/MainWindow_cs/MW_ElementsControls.cs	
+++ b/Ink Canvas/MainWindow_cs/MW_ElementsControls.cs	
@@ -28,10 +28,17 @@ namespace Ink_Canvas
                     string timestamp = "img_" + DateTime.Now.ToString("yyyyMMdd_HH_mm_ss_fff");
                     image.Name = timestamp;
 
-                    CenterAndScaleElement(image);
+                    // 新缩放逻辑：最大宽高为画布一半，并居中
+                    double maxWidth = inkCanvas.ActualWidth / 2;
+                    double maxHeight = inkCanvas.ActualHeight / 2;
+                    double scaleX = maxWidth / image.Width;
+                    double scaleY = maxHeight / image.Height;
+                    double scale = Math.Min(1, Math.Min(scaleX, scaleY));
+                    image.Width = image.Width * scale;
+                    image.Height = image.Height * scale;
+                    InkCanvas.SetLeft(image, (inkCanvas.ActualWidth - image.Width) / 2);
+                    InkCanvas.SetTop(image, (inkCanvas.ActualHeight - image.Height) / 2);
 
-                    InkCanvas.SetLeft(image, 0);
-                    InkCanvas.SetTop(image, 0);
                     inkCanvas.Children.Add(image);
 
                     timeMachine.CommitElementInsertHistory(image);
@@ -105,8 +112,6 @@ namespace Ink_Canvas
 
                 if (mediaElement != null)
                 {
-                    CenterAndScaleElement(mediaElement);
-
                     InkCanvas.SetLeft(mediaElement, 0);
                     InkCanvas.SetTop(mediaElement, 0);
                     inkCanvas.Children.Add(mediaElement);
@@ -155,27 +160,5 @@ namespace Ink_Canvas
             });
         }
         #endregion
-
-        private void CenterAndScaleElement(FrameworkElement element)
-        {
-            double maxWidth = SystemParameters.PrimaryScreenWidth / 2;
-            double maxHeight = SystemParameters.PrimaryScreenHeight / 2;
-
-            double scaleX = maxWidth / element.Width;
-            double scaleY = maxHeight / element.Height;
-            double scale = Math.Min(scaleX, scaleY);
-
-            TransformGroup transformGroup = new TransformGroup();
-            transformGroup.Children.Add(new ScaleTransform(scale, scale));
-
-            double canvasWidth = inkCanvas.ActualWidth;
-            double canvasHeight = inkCanvas.ActualHeight;
-            double centerX = (canvasWidth - element.Width * scale) / 2;
-            double centerY = (canvasHeight - element.Height * scale) / 2;
-
-            transformGroup.Children.Add(new TranslateTransform(centerX, centerY));
-
-            element.RenderTransform = transformGroup;
-        }
     }
 }
diff --git a/Ink Canvas/MainWindow_cs/MW_FloatingBarIcons.cs b/Ink Canvas/MainWindow_cs/MW_FloatingBarIcons.cs
index aac2b3d2..3ca38b99 100644
--- a/Ink Canvas/MainWindow_cs/MW_FloatingBarIcons.cs	
+++ b/Ink Canvas/MainWindow_cs/MW_FloatingBarIcons.cs	
@@ -2004,10 +2004,17 @@ namespace Ink_Canvas {
                     string timestamp = "img_" + DateTime.Now.ToString("yyyyMMdd_HH_mm_ss_fff");
                     image.Name = timestamp;
 
-                    CenterAndScaleElement(image);
+                    // 新缩放逻辑：最大宽高为画布一半，并居中
+                    double maxWidth = inkCanvas.ActualWidth / 2;
+                    double maxHeight = inkCanvas.ActualHeight / 2;
+                    double scaleX = maxWidth / image.Width;
+                    double scaleY = maxHeight / image.Height;
+                    double scale = Math.Min(1, Math.Min(scaleX, scaleY));
+                    image.Width = image.Width * scale;
+                    image.Height = image.Height * scale;
+                    InkCanvas.SetLeft(image, (inkCanvas.ActualWidth - image.Width) / 2);
+                    InkCanvas.SetTop(image, (inkCanvas.ActualHeight - image.Height) / 2);
 
-                    InkCanvas.SetLeft(image, 0);
-                    InkCanvas.SetTop(image, 0);
                     inkCanvas.Children.Add(image);
 
                     timeMachine.CommitElementInsertHistory(image);