As the main air-to-ground attack weapon of armed helicopters, the airborne gun can effectively destroy ground armed personnel and light armored vehicles.The light armored vehicles have rapid speed and fine maneuverability.In order to improve the precision of airborne gun on attacking the ground target moving at a high speed, a new method for ground moving target attacking is proposed.By fitting the trajectory of the moving target on the ground,and with consideration of the influence of wind and other factors,this new method has the advantages of high accuracy and high calculation speed.