diff --git a/SpineViewer/Controls/SpinePreviewer.cs b/SpineViewer/Controls/SpinePreviewer.cs
index 5f298d9..7e1262d 100644
--- a/SpineViewer/Controls/SpinePreviewer.cs
+++ b/SpineViewer/Controls/SpinePreviewer.cs
@@ -15,11 +15,6 @@ namespace SpineViewer.Controls
 {
     public partial class SpinePreviewer : UserControl
     {
-        /// <summary>
-        /// 画面拖放对象世界坐标源点
-        /// </summary>
-        private SFML.System.Vector2f? draggingSrc = null;
-
         /// <summary>
         /// 要绑定的 Spine 列表控件
         /// </summary>
@@ -310,6 +305,8 @@ namespace SpineViewer.Controls
 
         #endregion
 
+        #region 渲染更新管理
+
         /// <summary>
         /// 是否还在更新画面
         /// </summary>
@@ -399,7 +396,7 @@ namespace SpineViewer.Controls
 
                                 var spine = spines[i];
 
-                                spine.Update(IsUpdating ? delta : 0);
+                                spine.Update(IsUpdating ? delta : 0); // 只是时间不前进, 但是坐标变换还是要更新, 否则无法移动对象
 
                                 if (RenderSelectedOnly && !spine.IsSelected)
                                     continue;
@@ -420,6 +417,13 @@ namespace SpineViewer.Controls
             }
         }
 
+        #endregion
+
+        /// <summary>
+        /// 画面拖放对象世界坐标源点
+        /// </summary>
+        private SFML.System.Vector2f? draggingSrc = null;
+
         private void SpinePreviewer_SizeChanged(object sender, EventArgs e)
         {
             if (RenderWindow is null)