diff --git a/src/108shu.com/catalog.py b/src/108shu.com/catalog.py
new file mode 100644
index 0000000..1e7c0cf
--- /dev/null
+++ b/src/108shu.com/catalog.py
@@ -0,0 +1,53 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+"""
+Fetch catalog and output as JSON format.
+
+    USAGE: python3 catalog.py
+"""
+
+import re
+import json
+import requests
+from logger import logger
+from bs4 import BeautifulSoup
+
+userAgent = (  # default user agent
+    'Mozilla/5.0 (Windows NT 10.0; Win64; x64) '
+    'AppleWebKit/537.36 (KHTML, like Gecko) '
+    'Chrome/106.0.0.0 Safari/537.36 Edg/106.0.1370.47'
+)
+
+
+def httpRequest(url: str) -> str:  # fetch raw html content
+    request = requests.get(url, headers = {
+        'user-agent': userAgent,  # with fake user-agent
+        'accept-encoding': 'gzip, deflate',  # allow content compress
+    })
+    if request.status_code not in range(200, 300):  # http status code 2xx
+        raise RuntimeError('Http request failed')
+    return request.text
+
+
+def extractCatalog(rawHtml: str) -> dict:  # extract catalog from html content
+    catalog = {}
+    html = BeautifulSoup(rawHtml, 'lxml')
+    items = html.select('div[class="section-box"]')[1]
+    for item in items.select('a'):
+        name = re.search(r'^(第\d+章)(.*)$', item.text)
+        pageId = item.attrs['href'].replace('/book/54247/', '').replace('.html', '')
+        catalog['%s %s' % (name[1], name[2].strip())] = pageId
+    return catalog
+
+
+def fetchCatalog(pageNum: int) -> dict:  # fetch all catalog
+    catalog = {}
+    for pageId in range(1, pageNum + 1):  # traverse all pages
+        pageUrl = 'http://www.108shu.com/book/54247/index_%d.html' % pageId
+        logger.info('Page: %d -> `%s`' % (pageId, pageUrl))
+        catalog.update(extractCatalog(httpRequest(pageUrl)))
+    return catalog
+
+
+print(json.dumps(fetchCatalog(45)))
diff --git a/src/108shu.com/logger.py b/src/108shu.com/logger.py
new file mode 100644
index 0000000..36cfaf8
--- /dev/null
+++ b/src/108shu.com/logger.py
@@ -0,0 +1,47 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+"""
+Logger module:
+  INFO level -> stderr
+  DEBUG level -> runtime.log
+"""
+
+import sys
+import logging
+import colorlog
+
+logColor = {  # log color
+    'DEBUG': 'white',
+    'INFO': 'green',
+    'WARNING': 'yellow',
+    'ERROR': 'red',
+    'CRITICAL': 'bold_red',
+}
+
+dateFormat = '%Y-%m-%d %H:%M:%S'
+timeFormat = '%(asctime)s.%(msecs)03d'
+logFormat = '[%(levelname)s] %(message)s (%(module)s.%(funcName)s:%(lineno)d)'
+
+# load fileHandler -> log file
+fileHandler = logging.FileHandler('runtime.log', encoding = 'utf-8')
+fileHandler.setFormatter(logging.Formatter(
+    '[' + timeFormat + '] ' + logFormat,
+    datefmt = dateFormat
+))
+fileHandler.setLevel(logging.DEBUG)  # debug level for log file
+
+# load stdHandler -> stderr
+stdHandler = colorlog.StreamHandler()
+stdHandler.setFormatter(colorlog.ColoredFormatter(
+    '%(light_black)s' + timeFormat + '%(log_color)s ' + logFormat,
+    datefmt = dateFormat,
+    log_colors = logColor,
+    stream = sys.stderr
+))
+stdHandler.setLevel(logging.INFO)  # info level for stderr
+
+logger = logging.getLogger()
+logger.addHandler(stdHandler)
+logger.addHandler(fileHandler)
+logger.setLevel(logging.DEBUG)  # set log level in handler