diff --git a/src/tree.py b/src/tree.py
index d0f71da720e608b40f1177690889bb2112604120..95e1cbc5812810e30465eccc2632464caa5438e7 100644
--- a/src/tree.py
+++ b/src/tree.py
@@ -71,10 +71,6 @@ def check_export(base, cfg):
     return flag
 
 
-def gen_node_id():
-    return "oceanbase-" + uuid.uuid4().hex
-
-
 class TreeWalker:
     def __init__(self, root, tree_name, title=None, log=None):
         self.name = tree_name