diff --git a/download-npm.py b/download-npm.py
new file mode 100644
index 0000000..c7fafc1
--- /dev/null
+++ b/download-npm.py
@@ -0,0 +1,53 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+'''
+Author: Alvis Zhao
+Date: 2020-08-04 12:15:30
+LastEditTime: 2020-08-14 11:43:39
+Description: 解析package-lock.json下载npm缓存包
+'''
+
+import os
+import json
+import urllib.request
+
+dependencyDict = {}
+
+def analyzeDependency(dependencies):
+    for key in dependencies:
+        dependenciesInfo = dependencies[key]
+        
+        if "resolved" in dependenciesInfo:
+            url = dependenciesInfo["resolved"]
+            version = dependenciesInfo["version"]
+            # 存入字典去重
+            dependencyDict[key + "-" + version] = url
+            
+        if "dependencies" in dependenciesInfo:
+            childDependencies = dependenciesInfo["dependencies"]
+            analyzeDependency(childDependencies)
+
+output = "offline-packages"
+
+if not os.path.exists(output):
+    os.mkdir(output)
+
+f = open('package-lock.json', 'r')
+content = f.read()
+contentDict = json.loads(content)
+dependencies = contentDict["dependencies"]
+# 分析并保存依赖
+analyzeDependency(dependencies)
+
+# 按照key排序下载
+sortedKeys = sorted(dependencyDict)
+for key in sortedKeys:
+    url = dependencyDict[key]
+    params = url.split("?")[0].split("/")
+    filename = params[len(params) -1]
+    outputFile = output + os.sep + filename
+    print("downloading " + " " + key + "  " + url)
+    if not os.path.isfile(outputFile):
+        urllib.request.urlretrieve(url, outputFile)
+
+f.close()