Along with the advent of big data era and the development of cloud computing technology, computer virus has also been evolving swiftly. Traditional feature code technology has been unable to cope with the needs of the current network. Under such circumstances, in order to better guarantee the safety of data run under the environment of cloud, cloud security immune system (CSIS) based on the theory of human immunity and behavioral analysis technology has been put forward by taking operational mechanism of human immune system as theoretical basis, using its functional characteristics for reference and combining immune system of computer with behavioral analysis technology. Operational mechanism of CSIS and its characteristics have been analyzed.%随着大数据时代的到来以及云计算技术的发展，计算机病毒也在迅速演化，传统的特征码技术已经无法应对当前网络的需求。因此为了更好的保障云环境下数据运行的安全，以人体免疫系统（Human Immune System, HIS）运行机理为理论依据，借鉴其功能特性，结合计算机免疫系统（Computer Immune System，CIS）和行为分析技术，提出了基于人体免疫原理和行为分析技术的云安全免疫系统（Cloud Security Immune System，CSIS），设计了CSIS 运行机制和九个相关算法，并分析了其特点。
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