Abstract: With the development of fire control systems, higher demands are put forward on the functions and performances of fire control computers. Theory and techniques of trol computers. The paper describes fault-tolerant problems in fire control computers. Adopting a reusable double model redundancy structure of the central processing module and following the tactics of relying mainly on software with hardware subsidiary, the system can accomplish automatic fault-tolerant computation,and the user can always check on the running state of the system.Experiments have proved that the design scheme is correct and feasible.