The development of the technology of cloud computing is promoting the tremendous change of the world of computing ,followed by a hot discussion about the security of cloud computing .And more and more researchers have been focused on the virtualization security of cloud computing and the protection to the users'private data .This paper describes the benefits and the implication that the technology of virtualization brings to the cloud computing ,and analyzes the current issues and strategies about data security under the virtual cloud environment ,to protect users'private date from being be‐trayed .This paper proposes to build a single‐wire connection between the virtual machine and the users of cloud computing using the digital certificate technology ,so that people can achieve the protection and isolation of user's privacy data under the cloud environment and the cloud computing technology can service people with much higher security .%云计算技术的发展正在使得计算机世界发生着巨大的变革，随之而来是人们对云计算安全问题的热议，其中云计算的虚拟化安全和用户隐私数据保护问题已成为目前广大研究者关注的焦点，文章阐述了虚拟化对云计算带来的好处及其安全问题对云计算安全的影响，针对目前虚拟的云环境下所面临的用户隐私数据安全保护问题及应对策略进行分析，为了保护用户隐私数据在虚拟的云环境下不被泄露或窃取，文章提出了利用基于ECC算法的数字认证技术在虚拟机与云计算用户之间建立一种单线排他的认证连接，来实现在虚拟的云环境下用户隐私数据的安全保护与绝对隔离，使云计算能够更加安全地为人们提供服务。
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