diff --git a/src/UI/WPF/ViewModels/AliasNodeViewModel.cs b/src/UI/WPF/ViewModels/AliasNodeViewModel.cs
index 7108813..d44a656 100644
--- a/src/UI/WPF/ViewModels/AliasNodeViewModel.cs
+++ b/src/UI/WPF/ViewModels/AliasNodeViewModel.cs
@@ -97,6 +97,9 @@ namespace NavisworksTransport.UI.WPF.ViewModels
             set { _childCount = value; OnPropertyChanged(nameof(ChildCount)); OnPropertyChanged(nameof(HasChildren)); }
         }
 
+        /// <summary>树深度（0=根）</summary>
+        public int Depth { get; set; }
+
         /// <summary>是否有子节点</summary>
         public bool HasChildren => ChildCount > 0;
 
diff --git a/src/UI/WPF/Views/AliasTreeControl.xaml.cs b/src/UI/WPF/Views/AliasTreeControl.xaml.cs
index b7ccc2e..b8ba86b 100644
--- a/src/UI/WPF/Views/AliasTreeControl.xaml.cs
+++ b/src/UI/WPF/Views/AliasTreeControl.xaml.cs
@@ -33,6 +33,9 @@ namespace NavisworksTransport.UI.WPF.Views
         private Autodesk.Navisworks.Api.ModelItem _currentSelectionItem;
         private bool _built = false;
 
+        /// <summary>完整展示的最大层级深度（默认2层）</summary>
+        public int MaxFullDisplayDepth { get; set; } = 2;
+
         // ============================================================
         // 生命周期
         // ============================================================
@@ -278,7 +281,7 @@ namespace NavisworksTransport.UI.WPF.Views
                     var rootItem = model.RootItem;
                     if (rootItem != null)
                     {
-                        var node = BuildNode(rootItem, aliasMap);
+                        var node = BuildNode(rootItem, aliasMap, 0);
                         if (node != null)
                             rootNodes.Add(node);
                     }
@@ -299,7 +302,7 @@ namespace NavisworksTransport.UI.WPF.Views
         /// 递归构建节点树（主线程调用）
         /// </summary>
         private AliasNodeViewModel BuildNode(Autodesk.Navisworks.Api.ModelItem modelItem,
-                                               Dictionary<string, string> aliasMap)
+                                               Dictionary<string, string> aliasMap, int depth)
         {
             if (modelItem == null) return null;
 
@@ -321,13 +324,18 @@ namespace NavisworksTransport.UI.WPF.Views
                 ModelItem = modelItem,
                 OriginalName = modelItem.DisplayName ?? "?",
                 Alias = alias,
-                ChildCount = modelItem.Children.Count()
+                ChildCount = modelItem.Children.Count(),
+                Depth = depth
             };
 
             _nodeMap[key] = node;
 
-            // 第一层放占位节点以显示展开箭头
-            if (node.ChildCount > 0)
+            // 深度限制：超过阈值且无别名 → 不展开子节点
+            bool hasChildren = node.ChildCount > 0;
+            if (hasChildren && depth >= MaxFullDisplayDepth && string.IsNullOrEmpty(alias))
+                hasChildren = false;
+
+            if (hasChildren)
             {
                 node.Children.Add(new AliasNodeViewModel
                 {
@@ -361,7 +369,7 @@ namespace NavisworksTransport.UI.WPF.Views
 
                 foreach (var childItem in item.Children)
                 {
-                    var childNode = BuildNode(childItem, aliasMap);
+                    var childNode = BuildNode(childItem, aliasMap, parentNode.Depth + 1);
                     if (childNode != null)
                     {
                         childNode.Parent = parentNode;