diff --git a/DeedyDesigner/Deedy.Activity/ActionViewer.cs b/DeedyDesigner/Deedy.Activity/ActionViewer.cs
index 1d02b69..59b87ac 100644
--- a/DeedyDesigner/Deedy.Activity/ActionViewer.cs
+++ b/DeedyDesigner/Deedy.Activity/ActionViewer.cs
@@ -580,18 +580,7 @@ namespace Deedy.Activity
                         this.ShowRightExitline = Visibility.Visible;
                     }
 
-                    if (exitlinemanageable.ExitlinePosition == ExitlinePosition.LeftLower || exitlinemanageable.ExitlinePosition == ExitlinePosition.Rightlower)
-                    {
-                        //TODO：根据退出线方向是否相同的设置项调整子节点的退出线位置
-                        if (exitlinemanageable.IsExitlineAtSamePosition == true)
-                        {
-                            //TODO：同向退出线控制
-                        }
-                        if (exitlinemanageable.IsExitlineAtSamePosition == false)
-                        {
-                            //TODO：对向退出线控制
-                        }
-                    }
+                    this.ActionElement.AdjustExitlinePosition();
                 }
                 if (newValue is ILogicController logicController)
                 {
@@ -629,6 +618,7 @@ namespace Deedy.Activity
                     this.InstantInfo = this.ActionElement.InstantInfo;
                     break;
                 case nameof(IExitlineManageable):
+                    this.ActionElement.AdjustExitlinePosition();
                     break;
                 default: break;
             }
@@ -713,9 +703,9 @@ namespace Deedy.Activity
 
             base.OnDragLeave(e);
         }
-        private bool _CanDropInParent = false;
-        private bool _CanDropChild = false;
-        private DropPlacement _DropPlacement = DropPlacement.Uncertain;
+        protected internal bool _CanDropInParent = false;
+        protected internal bool _CanDropChild = false;
+        protected internal DropPlacement _DropPlacement = DropPlacement.Uncertain;
         protected override void OnDragOver(DragEventArgs e)
         {
             if (this.IsEventNeedToHandle(e.OriginalSource))
@@ -818,8 +808,8 @@ namespace Deedy.Activity
                 ToolTipService.SetVerticalOffset(this, position.Y + 16);
             }
         }
-        private readonly object _DragLock = new();
-        private Point? _DragStartPoint = null;
+        protected internal readonly object _DragLock = new();
+        protected internal Point? _DragStartPoint = null;
 
         protected override void OnPreviewMouseMove(MouseEventArgs e)
         {
diff --git a/DeedyDesigner/Deedy.Activity/Contract/Interface/IContainerElement.cs b/DeedyDesigner/Deedy.Activity/Contract/Interface/IContainerElement.cs
index d4b9eaa..cc9c180 100644
--- a/DeedyDesigner/Deedy.Activity/Contract/Interface/IContainerElement.cs
+++ b/DeedyDesigner/Deedy.Activity/Contract/Interface/IContainerElement.cs
@@ -20,7 +20,7 @@ namespace Deedy.Activity
         /// <summary>
         /// 如果类型上没有组装规则，则认为不允许组装，否则按照组装规则处理
         /// </summary>
-        /// <param name="unit">要进行组装检查的单元实例</param>
+        /// <param name="element">要进行组装检查的单元实例</param>
         /// <returns>是否允许组装</returns>
         public bool CombineChecking(IElement element, out DragDropEffects effects)
         {
diff --git a/DeedyDesigner/Deedy.Activity/Helper.cs b/DeedyDesigner/Deedy.Activity/Helper.cs
index 47d8ff3..ae2b399 100644
--- a/DeedyDesigner/Deedy.Activity/Helper.cs
+++ b/DeedyDesigner/Deedy.Activity/Helper.cs
@@ -212,5 +212,22 @@ namespace Deedy.Activity
 
             return default;
         }
+        public static void AdjustExitlinePosition(this IActionElement element)
+        {
+            if (element is IExitlineManageable exitlineManageable
+                && (exitlineManageable.ExitlinePosition == ExitlinePosition.LeftLower
+                || exitlineManageable.ExitlinePosition == ExitlinePosition.Rightlower))
+            {
+                //TODO：根据退出线方向是否相同的设置项调整子节点的退出线位置
+                if (exitlineManageable.IsExitlineAtSamePosition == true)
+                {
+                    //TODO：同向退出线控制
+                }
+                if (exitlineManageable.IsExitlineAtSamePosition == false)
+                {
+                    //TODO：对向退出线控制
+                }
+            }
+        }
     }
 }