中文摘要：

阐述云计算的重要性、优势及前景，探讨安全风险对云计算发展的影响，重点分析云计算安全风险理论研究现状，给出降低云计算安全风险的对策。对现有文献资料进行系统梳理、分析和总结。安全风险是云计算发展的重要障碍，现有理论研究存在的主要问题：一是成果不多，国外刚起步，国内更是匮乏；二是几乎全为定性研究，定量研究极为罕见；三是较多文献仅为简单风险探讨，缺乏深入研究。因此安全风险是云计算的一个重要的新研究方向。

英文摘要：

Firstly introduce importance,advantage and prospect on cloud computing,then indicate that security risk is a major obstacle for cloud computing development,emphatically analyze security risk research status in cloud computing,and point out the countermeasures of reducing the risk of cloud computing security. Analyze and summarize the existing literature systematically. Security risk is the important obstacle of the development of cloud computing,the existing main problems of theoretical study：one is few achievements,start-up a-broad,domestic is lack. The second is for almost all qualitative research,quantitative research is rare. Three is more document only for simple risk,lack of in-depth study. So the security risk is an important new research direction for cloud computing.