Abstract: In order to further improve the quality of passenger transport services and reduce the operating costs of enterprises, the railway ticket media needs to be electronic. This paper compared the characteristics of mainstream e–ticket carriers and introduced the advantages of domestic cryptographic algorithms, put forward the QR code data structure and platform architecture of e-ticket, as well as the business process of QR code e–ticket, expounded the key technologies of double off-line gate crossing and multi-level key management, summarized the application and promotion of QR code platform.