According to UAV flight control' character，this paper presents a new three section combination control tactics. The control tactics include coventional control based on the design of linear control system,super-conventional control based on fuzzy measurement inference and harzard control based on critical criterion. The centre of process unit in UAV receives the signals of informative sources such as radar,sensors and so on，figures out,processes and produces the evaluation signalAccording to it ，the status selector selects the right control signal and controls the terrace of UAV.