diff --git a/app/tree/index.py b/app/tree/index.py
index 6db5e09..328d599 100644
--- a/app/tree/index.py
+++ b/app/tree/index.py
@@ -656,7 +656,9 @@ class TreeIndex:
         for r in d["roots"]:
             roots.append(L1Node.from_dict(r))
 
-        return cls(metadata=meta, roots=roots)
+        obj = cls(metadata=meta, roots=roots)
+        obj._validate_id_uniqueness()
+        return obj
 
     def _validate_id_uniqueness(self) -> None:
         """校验树中所有节点 ID 的唯一性。