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The flight control computer(FCC)is the core unit of the UAV flight control system, its reliability directly affects the safety of the UAV. In order to improve the stability and reliability of the flight control computer, In combination with engineering practice, an overall framework of mixed three redundant computer hardware was designed, the working principle of each component was described. Using Markov model to analysis the reliability, the results show that the reliability of the mixed three redundant FCC improved obviously than the single machine, meets the reliability requirements of the UAV flight control computer, can be used as a reference scheme for the high reliability and long endurance UAV flight control computer design.