Abstract: The cyber attacks against infrastructure such as railways have intensified. In order to ensure the network security of the railway system, it is urgent to further optimize it. This paper briefly combs the structure of the railway network system, considering the development of the current network security defense system, and proposes to apply the latest network security situation awareness technology to the construction of the railway network system, by fully applying the computing power of big data analysis, which build the railway network security situation awareness platform architecture based on big data, and providethe solution for the hidden dangers of the current railway network security defense.

Key words: railway network security, informaiton security, cyber situational awareness, big data, security defense

摘要： 针对铁路等基础设施的网络攻击愈演愈烈，为了保障铁路系统的网络安全，亟需对现有网络安全系统进行进一步的优化.对铁路网络系统的结构进行了梳理，结合当前网络安全防御体系的发展，提出将最新的网络安全态势感知技术应用于铁路网络系统的建设，并充分应用大数据分析的计算能力，构建了基于大数据分析的铁路网络安全态势感知平台架构，为当前铁路网络安全防御所面临的隐患提出了解决方案.

关键词: 铁路网络安全, 信息安全, 网络安全态势感知, 大数据, 安全防御