diff --git a/src/Utils/SectionClipHelper.cs b/src/Utils/SectionClipHelper.cs
index 1bd7757..13daff8 100644
--- a/src/Utils/SectionClipHelper.cs
+++ b/src/Utils/SectionClipHelper.cs
@@ -246,6 +246,14 @@ namespace NavisworksTransport.Utils
             }
         }
 
+        /// <summary>
+        /// 恢复剖面盒（用于被 Navisworks ExportToNwd 内部关闭后重新启用）
+        /// </summary>
+        public static void RestoreClipBox(BoundingBox3D box)
+        {
+            ApplyClipBox(box);
+        }
+
         /// <summary>
         /// 获取当前剖面盒
         /// </summary>
diff --git a/src/Utils/VisibilityHelper.cs b/src/Utils/VisibilityHelper.cs
index 441e4ae..e35434f 100644
--- a/src/Utils/VisibilityHelper.cs
+++ b/src/Utils/VisibilityHelper.cs
@@ -2,6 +2,7 @@ using System;
 using System.Collections.Generic;
 using System.Linq;
 using Autodesk.Navisworks.Api;
+using NavisworksTransport.Utils;
 using NavisApplication = Autodesk.Navisworks.Api.Application;
 
 namespace NavisworksTransport
@@ -261,9 +262,14 @@ namespace NavisworksTransport
                 return default(T);
             }
 
-            // 保存当前状态
+            // 保存可见性状态
             var savedState = SaveVisibilityStateInternal(document);
 
+            // 保存剖面盒状态（Navisworks ExportToNwd 会内部关闭剖分）
+            bool clipWasEnabled = SectionClipHelper.IsClipBoxEnabled;
+            BoundingBox3D savedClipBox = default;
+            bool hasClipBox = SectionClipHelper.TryGetCurrentClipBox(out savedClipBox);
+
             try
             {
                 // 1. 全部显示
@@ -281,8 +287,14 @@ namespace NavisworksTransport
             }
             finally
             {
-                // 4. 恢复状态
+                // 4. 恢复可见性状态
                 RestoreVisibilityStateInternal(document, savedState);
+
+                // 5. 恢复剖面盒（Navisworks 导出时会关闭）
+                if (clipWasEnabled && !SectionClipHelper.IsClipBoxEnabled && hasClipBox)
+                {
+                    SectionClipHelper.RestoreClipBox(savedClipBox);
+                }
             }
         }