中文摘要：

云计算一开始就立足于商业，为企业提出了一个更为广阔的发展空间。文章通过介绍各主流厂商比如Google，IBM，微软等的云计算的理念及云计算的共有特点，从内、外部架构来分析云计算的价值，最后提出了云计算模式所面临的关于安全性、竞争性等的挑战。

英文摘要：

Recent researches on Cloud Computing suggest that it is a new business model which can bring big benefits to many companies and users. This paper introduces the main ideas of Cloud Computing among different mainstream companies. Then it analyzes its architecture through an external view and an internal view. After that, it mines the value of Cloud Computing. On that basis, this paper at last puts forward some challenge problems which Cloud Computing will be faced with.