diff --git a/danmaku_xml_helper.py b/danmaku_xml_helper.py
new file mode 100644
index 0000000..e74ef5e
--- /dev/null
+++ b/danmaku_xml_helper.py
@@ -0,0 +1,54 @@
+import datetime
+import os
+import argparse
+
+from bs4 import BeautifulSoup
+
+
+class NoDanmakuException(Exception):
+    ...
+
+
+class DanmakuFormatErrorException(Exception):
+    ...
+
+
+def check_file_exist(file):
+    if not os.path.isfile(file):
+        raise FileNotFoundError("文件不存在：%s" % file)
+
+
+def get_file_start(file: os.PathLike[str]) -> float:
+    with open(file, "r", encoding="utf-8") as f:
+        soup = BeautifulSoup("".join(f.readlines()), "lxml")
+        danmaku_item = soup.find("d")
+        if danmaku_item is None:
+            # 没有弹幕？
+            raise NoDanmakuException()
+        danmaku_info = danmaku_item["p"]
+        split_info = danmaku_info.split(",")
+        if len(split_info) < 5:
+            raise DanmakuFormatErrorException()
+        bias_sec = float(split_info[0])
+        bias_ts_ms = int(split_info[4])
+        return bias_ts_ms / 1000 - bias_sec
+
+
+def diff_danmaku_files(base_file: os.PathLike[str], file: os.PathLike[str]) -> float:
+    return get_file_start(file) - get_file_start(base_file)
+
+
+if __name__ == '__main__':
+    parser = argparse.ArgumentParser()
+    parser.add_argument("base", help="以此为标准")
+    parser.add_argument("file", nargs="+", help="需要对齐的文件")
+    args = parser.parse_args()
+    check_file_exist(args.base)
+    base_start_ts = get_file_start(args.base)
+    base_start = datetime.datetime.fromtimestamp(base_start_ts)
+    print("[+] 基准文件[{:s}]，开始时间：{:.3f}，时间：{}".format(args.base, base_start_ts, base_start))
+    for _file in args.file:
+        check_file_exist(_file)
+        file_start_ts = get_file_start(_file)
+        diff_sec = file_start_ts - base_start_ts
+        print("[+] 待调整文件[{:s}]，开始时间：{:.3f}，偏差：{:.3f}".format(_file, file_start_ts, diff_sec))
diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 0000000..6721c87
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1,7 @@
+beautifulsoup4==4.10.0
+bs4==0.0.1
+lxml==4.8.0
+pip==21.3.1
+setuptools==60.2.0
+soupsieve==2.3.1
+wheel==0.37.1