Abstract: In order to establish a comprehensive network security defense line and improve network security guarantee capability in the increasingly fierce cyberspace security game, this paper summarized and analyzed relevant models at home and abroad, analyzed the role of establishing a railway network security capability maturity model and security capability evaluation indicators, studied and constructed a railway network security capability maturity model, and proposed a network security capability maturity evaluation index. The research results can provide technical support for the evaluation of railway network security capabilities.