The CTC system is the core of information system of railway transportation, so the reliability of data protection is very important. Manually regular database backup and manually recovery in the event of failure cannot guarantee uninterrupted operation of the railway transportation system. We design a solution based on Oracle Data Guard technology to implement real-time data backup and the restore process is completely transparent to the user, which does not affect the normal use of the dispatcher and the station attendant. We can execute the backup process under the condition of minimum resource available. We implement the solution and achieve excellent effect in the application scenario.