Abstract: Tactics decision-making system of air-to-ground attack is important in modern combat along with high-tech of weapon,complexity of battlefield and quicken of combat rhythm.The unmanned combat airplane vehicle(UCAV) teams tactics decision-making based on infiuence diag rams with their advantages of dealing with uncertainty inference is built.The method is tested with a given condition.The simulation results show that the proposed system can improve the decision-making accurate and intelligent and the algorithm is simple,perspicuity and apt to realize.