Abstract: With the continuous development of the railway information system in the direction of data centralization and application centralization, the safe operation of the system has become the focus of risk control, the planning and implementation of database disaster recovery system is the priority among priorities. This article was based on the construction of database disaster recovery system which was used Oracle Data Guard of data replication technology, and also the key business of Harbin Railway Administration. The article described the database disaster recovery system planning, design process, related matters. The system was implemented, could be used to recover disaster and monitor database.