Abstract: Focused on the security risks and compliance requirements faced in the circulation of railway passenger transport data, this paper studied the key technologies for secure circulation of railway passenger transport data, and designed and implemented a trusted circulation platform for railway passenger transport data. The paper utilized blockchain technology, data exchange technology based on digital envelopes, and sensitive data circulation technology based on secure multi-party computation to implement secure sharing and interaction of railway passenger transport data between various systems and platforms within and outside the railway. It provides ideas and methods for the secure application of railway data and promotes the high-quality development of China railway ticketing and reservation system.