Abstract: In order to solve the problem of passenger information security in the process of using railway passengerinformation, this article put forward and designed a "China Railway Customer Code" of passenger information protectionand security application based on railway ticketing and reservation system, as well as a set of standardized and effectivedata protection and application process system for railway passenger information. By using these means, the security ofpassenger privacy information in the process of using passenger big data for railway researchers was ensured to the greatestextent, which laid a solid foundation for further improving the construction of intelligent railway system. By researchingand solving the security problems in the process of using passenger big data, it was helpful to actively and steadily improvethe service ability of railway passenger big data application, realize the strategic transformation and business innovation ofrailway operation enterprises, and effectively avoid the possible public opinion and legal risks in the process of exploring andinnovating.