Abstract: The fault-tolerant technique is studied on the simulated nework fire-control system. A general fault-tolerant design of dul-hot reserved redundant computers computers systemis presented A hardware and software system is established to implement the design In the above design , the problem of fault-computer location is eusily solved, which is diffi- culty solved for other normal fault-tolerant system. Furthermore, the time of fauil-dete- ction, fault-computer diagnosis , fault-computer switch is greatly shortened.