diff --git a/src/release/release.py b/src/release/release.py
index 02babd1..82ece9d 100755
--- a/src/release/release.py
+++ b/src/release/release.py
@@ -1,6 +1,8 @@
 #!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 
+import sys
+import multiprocessing
 from copy import deepcopy
 from concurrent import futures
 
@@ -14,17 +16,17 @@ from utils import staticRelease
 from utils import calibreRelease
 from utils import gitbookRelease
 
-# TODO: update gitbook links
 
 '''
 In order to avoid unintentional modification of the content,
     using deepcopy function here.
 '''
 def allRelease(metadata: dict, content: dict) -> None:
+    cpuCount = multiprocessing.cpu_count()
     txtRelease(deepcopy(metadata), deepcopy(content))
     jsonRelease(deepcopy(metadata), deepcopy(content))
     gitbookRelease(deepcopy(metadata), deepcopy(content))
-    threadPool = futures.ThreadPoolExecutor(max_workers = 4)
+    threadPool = futures.ThreadPoolExecutor(max_workers = cpuCount)
     azw3Task = threadPool.submit(azw3Release, deepcopy(metadata), deepcopy(content))
     epubTask = threadPool.submit(epubRelease, deepcopy(metadata), deepcopy(content))
     mobiTask = threadPool.submit(mobiRelease, deepcopy(metadata), deepcopy(content))
@@ -33,7 +35,7 @@ def allRelease(metadata: dict, content: dict) -> None:
     print('All build complete')
 
 
-releaseEntry = {
+releaseEntry = {  # release functions
     'all': allRelease,
     'txt': txtRelease,
     'json': jsonRelease,
@@ -46,6 +48,7 @@ releaseEntry = {
 }
 
 
-releaseSrc = 'rc-5'
-bookMetadata, bookContent = loadBook(releaseSrc)
-releaseEntry['all'](bookMetadata, bookContent)
+if sys.argv[1] not in releaseEntry:
+    print('Unknown target `%s` in %s' % (sys.argv[1], [x for x in releaseEntry]))
+bookMetadata, bookContent = loadBook(sys.argv[2])
+releaseEntry[sys.argv[1]](bookMetadata, bookContent)
diff --git a/src/release/utils/common.py b/src/release/utils/common.py
index 735214c..e36a9e3 100644
--- a/src/release/utils/common.py
+++ b/src/release/utils/common.py
@@ -4,7 +4,6 @@
 import os
 import json
 
-projectDesc = '《栩栩若生》电子书'
 projectUrl = 'https://github.com/dnomd343/xxrs-crawler'
 
 rootPath = os.path.join(  # project root directory
@@ -33,6 +32,10 @@ resourceInfo = {  # resource download links
         'https://res.343.re/Share/XXRS/%E6%A0%A9%E6%A0%A9%E8%8B%A5%E7%94%9F.txt',
         'https://cdn.dnomd343.top/xxrs/%E6%A0%A9%E6%A0%A9%E8%8B%A5%E7%94%9F.txt',
     ],
+    'AZW3 下载': [
+        'https://res.343.re/Share/XXRS/%E6%A0%A9%E6%A0%A9%E8%8B%A5%E7%94%9F.azw3',
+        'https://cdn.dnomd343.top/xxrs/%E6%A0%A9%E6%A0%A9%E8%8B%A5%E7%94%9F.azw3',
+    ],
     'EPUB 下载': [
         'https://res.343.re/Share/XXRS/%E6%A0%A9%E6%A0%A9%E8%8B%A5%E7%94%9F.epub',
         'https://cdn.dnomd343.top/xxrs/%E6%A0%A9%E6%A0%A9%E8%8B%A5%E7%94%9F.epub',
diff --git a/src/release/utils/release.py b/src/release/utils/release.py
index cfa9edc..ba2e385 100644
--- a/src/release/utils/release.py
+++ b/src/release/utils/release.py
@@ -11,7 +11,6 @@ from .common import isRoot
 from .common import rootPath
 from .common import saveFile
 from .common import projectUrl
-from .common import projectDesc
 from .common import releaseInfo
 from .common import createFolder
 from .common import resourceInfo
@@ -40,7 +39,7 @@ def gitbookRelease(metadata: dict, content: dict) -> None:
     cover = gitbookMetadata(metadata)
     for (resName, resUrls) in resourceInfo.items():
         cover += '{% hint style="success" %}\n' \
-            + '### >>> [%s](%s) <<<\n' % (resName, resUrls[0]) \
+            + '### [%s](%s)（[备用地址](%s)）\n' % (resName, resUrls[1], resUrls[0]) \
             + '{% endhint %}\n\n'
     cover += '{%% embed url="%s" %%}\n项目地址\n{%% endembed %%}\n' % projectUrl
 
@@ -60,14 +59,14 @@ def staticDepends(workDir: str, metadata: dict, content: dict) -> None:
 
     cover = gitbookMetadata(metadata) + '<hr/>\n'
     for (resName, resUrls) in resourceInfo.items():
-        cover += '\n{% hint style="tip" %}\n' \
-            + '#### [%s](%s)（[备用地址](%s)）\n' % (resName, resUrls[0], resUrls[1]) \
+        cover += '\n{% hint style="none" %}\n' \
+            + '#### [%s](%s)（[备用地址](%s)）\n' % (resName, resUrls[1], resUrls[0]) \
             + '{% endhint %}\n'
 
     bookInfo = json.dumps({
         'title': metadata['name'],
         'author': metadata['author'],
-        'description': projectDesc,
+        'description': '《%s》在线阅读' % metadata['name'],
         "language": "zh-hans",
         'plugins': [
             '-lunr', '-search', '-sharing', 'hints', 'github',
@@ -174,7 +173,7 @@ def calibreRelease(metadata: dict, content: dict) -> None:
 
 def calibreBuild(workDir: str, suffix: str, extOption: list, metadata: dict, content: dict) -> None:
     buildDir = '/xxrs/'
-    calibreImage = 'linuxserver/calibre'
+    calibreImage = 'linuxserver/calibre:6.14.1'
     calibreCommand = [
         'ebook-convert',
         'xxrs.zip', 'xxrs%s' % suffix,