为了有效利用企业分布于全球范围内数以百万计的计算机软硬件资源,Google公司2007年首次提出云计算技术,随后在全球IT、金融和能源等多行业快速发展,其相关的各种云计算应用也应运而生。中国云计算网将“云”定义为:云计算是分布式计算(Distributed Computing)、并行计算(Parallel Computing)和网格计算(Grid Computing)的发展,或者说是这些科学概念的商业实现,其基本构成如图1所示。另一些学者认为云计算技术是 In order to make effective use of the millions of computer hardware and software resources that enterprises distribute in the world, Google first proposed cloud computing technology in 2007 and then rapidly developed in many industries such as IT, finance and energy in the world. Its related various cloud Computing applications also came into being. China Cloud Computing defines Cloud as the development of distributed computing, parallel computing and grid computing, or the commercial implementation of these scientific concepts , The basic structure shown in Figure 1. Other scholars think cloud computing technology is