To guarantee the safe and reliable operation of its information system, our hospital, in light of the features of HIS, came up with a feasible design plan for the server system. The paper discusses the fault tolerant technique, the key technique involved in the plan, explains the mechanism of the ROSE HA fault tolerant software, analyses the implementation method of the RAID technique and the application of the disc array, describes the operating principles of the VERITAS Backup EXEC software, introduces the on line backup method and strategy for the ORACLE database, and illustrates the implementation method of the banking of the central servers dual systems and the configuration of relevant hardware.