diff --git a/src/Add-on/DrawBoard/ActivityLayerBoardTool.ts b/src/Add-on/DrawBoard/ActivityLayerBoardTool.ts
index fe6c32f08..c59169cba 100644
--- a/src/Add-on/DrawBoard/ActivityLayerBoardTool.ts
+++ b/src/Add-on/DrawBoard/ActivityLayerBoardTool.ts
@@ -285,7 +285,7 @@ class ActivityLayerBoardTool
         {
             let nId: ObjectId;
             let otherBoard = brNailMap.get(nails[i]);
-            if (i < oldNailIds.length)
+            if (i < oldNailIds.length && oldNailIds[i])
             {
                 let nail = oldNailIds[i].Object as CylinderHole;
                 if (nail.IsErase)
@@ -296,6 +296,12 @@ class ActivityLayerBoardTool
                 nail.Height = nails[i].Height;
                 nail.Position = nails[i].Position;
                 nId = nail.Id;
+
+                if (nail.FId !== otherBoard.Id)
+                {
+                    nail.FId = otherBoard.Id;
+                    otherBoard.AppendNails([nId]);
+                }
             }
             else
             {
@@ -347,6 +353,8 @@ class ActivityLayerBoardTool
                 }
                 if (j < oldNails.length)
                     temp.push(...oldNails.splice(j, 1));
+                else
+                    temp.push(undefined); //不存在可以复用的层板钉,占个位 重新添加
             }
             oldNails.unshift(...temp);
         }