Abstract: In order to further improve the scalability and reusability of the electronic ticket bank system for railway passenger tickets, based on the original architecture, this paper proposed a service architecture based transformation of the electronic ticket bank system, and elaborated on key transformation technologies such as system adaptation, database migration, and business flow migration. The trial operation results show that the transformed system has good scalability and business reuse ability, provides strong support for large-scale concurrent transactions and business innovation in railway ticketing and reservation system.