Abstract: In order to transform the data emergency model of railway passenger ticketing and reservation system from centralized to distributed, this paper analyzed and compared the key technical characteristics of distributed system, and studied the application technology of blockchain, designed a double chain passenger ticket intelligent emergency model based on the private chain of emergency transaction and the private chain of emergency data, and expounded the implementation of the passenger ticket intelligent emergency system from the aspects of network topology, synchronization mechanism, data structure organization, etc. This model can meet the needs of distributed synchronization, rapid response and data trace ability of the ticket emergency system.