Cloud computing is the third wave of innovation in the IT industry ,,following PCs and the Internet and has grown rapidly since 2008 [2]. The foreign cloud computing industry started relatively early, and the technology development is relatively mature. The industry has gathered many well-known cloud computing service providers including Amazon, Google, Microsoft, VMware, and Racespace. Among them, Amazon, as the top service provider in the cloud computing industry, accounts for 41%-43% of the global cloud computing market share [3], and its products mainly include Elastic Compute Cloud and Simple Storage Service (S3). EC2 is a platform for users to access cloud servers through Web services, and users can install and run any software applications they need on EC2, which provides users with adjustable cloud computing capabilities.