diff --git a/src/tree.py b/src/tree.py
index 99a69363bd3f9de50fd9f017b7164fde53bce8c8..0c58d32b0da0e7099c2d2804fc97cdc35b240e28 100644
--- a/src/tree.py
+++ b/src/tree.py
@@ -7,7 +7,6 @@ import sys
 import uuid
 import re
 
-
 id_set = set()
 logger = logging.getLogger(__name__)
 logger.setLevel(logging.INFO)
@@ -17,6 +16,14 @@ handler.setFormatter(formatter)
 logger.addHandler(handler)
 
 
+def search_author(author_dict, username):
+    for key in author_dict:
+        names = author_dict[key]
+        if username in names:
+            return key
+    return username
+
+
 def user_name(md_file, author_dict):
     ret = subprocess.Popen([
         "git", "log", md_file
@@ -27,11 +34,11 @@ def user_name(md_file, author_dict):
         if line.startswith('Author'):
             author_lines.append(line.split(' ')[1])
     author_nick_name = author_lines[-1]
-    return author_dict.get(author_nick_name, "")
+    return search_author(author_dict, author_nick_name)
 
 
 def load_json(p):
-    with open(p, 'r') as f:
+    with open(p, 'r', encoding="utf-8") as f:
         return json.loads(f.read())
 
 
@@ -87,13 +94,13 @@ def check_export(base, cfg):
 
 class TreeWalker:
     def __init__(
-        self, root,
-        tree_name,
-        title=None,
-        log=None,
-        authors=None,
-        enable_notebook=None,
-        ignore_keywords=False
+            self, root,
+            tree_name,
+            title=None,
+            log=None,
+            authors=None,
+            enable_notebook=None,
+            ignore_keywords=False
     ):
         self.ignore_keywords = ignore_keywords
         self.authors = authors if authors else {}