在网络信息时代,计算机网络渗透在人们生活的各个方面,对人们的生活和生产产生了深刻的影响。但是现阶段人们在应用计算机网络信息的时候存在不同程度的安全隐患,文章在阐述计算机网络信息系统安全体系结构和存在的安全威胁因素的基础上,对计算机信息系统安全策略和威胁防护对策进行分析。 In the era of network information, the penetration of computer network in all aspects of people’s life has a profound impact on people’s life and production. However, people have different levels of security risks when using computer network information at this stage. On the basis of expatiating the security architecture of computer network information system and the existing security threats, this paper analyzes the security strategy and threat countermeasures of computer information system .