diff --git a/README.md b/README.md
index c2b2ce853597b8eec8481ec818c93d72c5eb8d12..d6a443d0d55c6a028cf97d73c66f59585cdccc24 100644
--- a/README.md
+++ b/README.md
@@ -46,3 +46,7 @@ CSDN 技能树结构（章节、元信息、习题）解释器，支持技能树
 - 增加 FAQ
 - 修正 `requirements.txt` 包拼写错误
 
+### 0.0.13
+
+- 增加 subtree 字段
+
diff --git a/src/skill_tree/tree.py b/src/skill_tree/tree.py
index cf20030dd85808df7002f03df0180aca9b1224e1..fb8bd2e64166bcac5408312fdd9a695246a4d1a8 100644
--- a/src/skill_tree/tree.py
+++ b/src/skill_tree/tree.py
@@ -71,7 +71,8 @@ def ensure_config(path):
         node = {"keywords": [],
                 "keywords_must": [],
                 "keywords_forbid": [],
-                "group": 0}
+                "group": 0,
+                "subtree": ""}
         dump_json(config_path, node, exist_ok=True, override=False)
         return node
     else:
@@ -132,7 +133,8 @@ class TreeWalker:
             "children": [],
             "keywords_must": root.get("keywords_must", []),
             "keywords_forbid": root.get("keywords_forbid", []),
-            "group": root.get("group", 0)
+            "group": root.get("group", 0),
+            "subtree": root.get("subtree", "")
         }
         self.tree[root["tree_name"]] = root_node
         self.load_levels(root_node)
@@ -189,7 +191,8 @@ class TreeWalker:
                 "children": [],
                 "keywords_must": config.get("keywords_must", []),
                 "keywords_forbid": config.get("keywords_forbid", []),
-                "group": config.get("group", 0)
+                "group": config.get("group", 0),
+                "subtree": config.get("subtree", "")
             }
         }
 
@@ -243,7 +246,8 @@ class TreeWalker:
                 "node_id": self.gen_node_id(),
                 "keywords_must": [],
                 "keywords_forbid": [],
-                "group": 0
+                "group": 0,
+                "subtree": ""
             }
             dump_json(config_path, config, exist_ok=True, override=True)
         else:
@@ -276,7 +280,8 @@ class TreeWalker:
                 "keywords": [],
                 "keywords_must": [],
                 "keywords_forbid": [],
-                "group": 0
+                "group": 0,
+                "subtree": ""
             }
             dump_json(config_path, config, exist_ok=True, override=True)
         else:
@@ -296,7 +301,8 @@ class TreeWalker:
                 "export": [],
                 "keywords_must": [],
                 "keywords_forbid": [],
-                "group": 0
+                "group": 0,
+                "subtree": ""
             }
             dump_json(config_path, config, exist_ok=True, override=True)
         else:
@@ -347,7 +353,8 @@ class TreeWalker:
                 "children": [],
                 "keywords_must": config.get("keywords_must", []),
                 "keywords_forbid": config.get("keywords_forbid", []),
-                "group": config.get("group", 0)
+                "group": config.get("group", 0),
+                "subtree": config.get("subtree", "")
             }
         }
         return num, result
@@ -362,7 +369,8 @@ class TreeWalker:
                 "children": config.get("children", []),
                 "keywords_must": config.get("keywords_must", []),
                 "keywords_forbid": config.get("keywords_forbid", []),
-                "group": config.get("group", 0)
+                "group": config.get("group", 0),
+                "subtree": config.get("subtree", "")
             }
         }
         # if "children" in config: