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Cloud computing has brought new changes and opportunities to IT industry. It is the result of the evolution of a variety of techniques. And the railway department will use the cloud computing technology to achieve the sharing of the railway information resources and to improve the capacity of information processing. But with the development of the cloud computing, it also faced with many difficulties, cloud computing security has become the leading cause of impeding its development. Cloud computing security has become a hot topic in industry and academic research. This paper will explore the status of the development of cloud computing security, analyze the data privacy, security auditing, data monitoring and other challenges that the cloud computing security faced with. We will describe the solutions which the industry and academia proposed for some key issues of cloud computing security, such as virtualization security and traffic monitoring between virtual machines and so on. And we analyzed the security of cloud computing in railway environment. We proposed a cloud computing security reference framework. The purpose of this paper is attempted to bring greater clarity landscape about cloud computing security.