In order to meet the realistic simulation requirements of the target drone system to the incoming target, the formation strategy and formation mode of the target drones formation cooperative flight system are studied. Combined with the characteristics of cooperative flight of target drones formation, its advantages and disadvantages are analyzed. The 2 control levels of cooperative flight control of target drone formation are studied. The formation controller based on the relative motion is designed, the high subsonic target drone system is used to do related flight simulation. This paper briefly summarizes the future research and development direction of the target drones formation system, based on the existing engineering experience. The results show that the controller can maintain control the height distance well, the forward distance and lateral distance is gradually convergent.