Abstract: According to the volume and complexity of electronic payment for railway ticketing and reservation system, based on the combination of Hadoop technology and distributed memory database technology, this article proposed an electronic payment data audit system based on rule engine, which could provide strong security guarantee for passengers' duplicate payment, non-payment after payment, bank refund failure and so on. Through the system test, the data audit mechanism has the ability to improve the processing business of railway ticket electronic payment link, and provides technical support for improving passengers' good ticket-buying experience.