diff --git a/src/tree.py b/src/tree.py
index 89483a0d2f1fe59adbe1820eac11381ffa86c80d..61b5b8950df71658adfa6243961eab5ca45a8da2 100644
--- a/src/tree.py
+++ b/src/tree.py
@@ -51,8 +51,6 @@ def parse_no_name(d):
         no = int(m.group(1))
         dir_name = m.group(2)
     except:
-        logger.error('parser no name failed')
-        logger.error(d)
         sys.exit(0)
 
     return no, dir_name
@@ -108,11 +106,9 @@ class TreeWalker:
                 for index, section_node in enumerate(chapter_node["children"]):
                     section_title = list(section_node.keys())[0]
                     full_path = os.path.join(
-                        chapter_path, f"{section_title}")
+                        chapter_path, f"{index}.{section_title}")
                     if os.path.isdir(full_path):
                         self.ensure_exercises(full_path)
-                    else:
-                        pass
 
         tree_path = os.path.join(self.root, "tree.json")
         dump_json(tree_path, self.tree, exist_ok=True, override=True)
@@ -165,8 +161,6 @@ class TreeWalker:
                 sections.append((num, section))
 
         sections.sort(key=lambda item: item[0])
-        for item in sections:
-            item[1]['origin_num'] = item[0]
         chapter_node["children"] = [item[1] for item in sections]
         return chapter_node
 
@@ -250,7 +244,7 @@ class TreeWalker:
     def extract_node_env(self, path):
         try:
             _, dir = os.path.split(path)
-            # self.logger.info(path)
+            self.logger.info(path)
             number, title = dir.split(".", 1)
             return int(number), title
         except Exception as error:
@@ -273,7 +267,7 @@ class TreeWalker:
         config = self.ensure_section_config(full_name)
         num, name = self.extract_node_env(full_name)
         result = {
-            f"{num}.{name}": {
+            name: {
                 "node_id": config["node_id"],
                 "keywords": config["keywords"],
                 "children": config.get("children", [])
@@ -290,4 +284,4 @@ class TreeWalker:
             exercise = load_json(full_name)
             if "exercise_id" not in exercise:
                 exercise["exercise_id"] = uuid.uuid4().hex
-                dump_json(full_name, exercise, True, True)
+                dump_json(full_name, exercise)