In order to improve the maneuver decision ability of fighters under the condition of insufficient information， a method of aircraft air combat maneuver decision based on three-way decision was proposed. Firstly， the three-way decision intention recognition model was used to recognize the target intention. Secondly， after introducing the combat intention factor of the target into the threat assessment， a dynamic adjustment method of maneuver decision weight factor based on three-way decision was proposed with the combination of the target threat degree. Finally， the evaluation function of maneuver decision factor was constructed by using fuzzy logic， and the optimal maneuver mode of aircraft at each stage was obtained by using the dynamic adjustment strategy of weight and maneuver decision evaluation function， thus forming the effective and feasible flight route. Simulation results show that the proposed aircraft air combat maneuver decision method based on three-way decision is feasible and effective.