The first step of flying wing unmanned aerial vehicle (UAV) maneuverable flight is to generate a relatively reasonable virtual maneuvering commands for the guidance loop and control loop to provide input instructions. In order to generate effective virtual maneuvering commands, the method of the maneuverable flight trajectory optimization and path self-generation is proposed. Taking the flying wing UAV maneuvering flight as optimization research object, a maneuvering tracjectory optimization method is proposed, which takes flying wing UAV control parameter variable rate as optimization parameter and track fragment sets up constraint condition.The change rate of the maneuvering flight control rate reflects the limitation of the UAV's control ability, and the track fragment constraint reflects the requirements of the accurate track and the soft operation. The somersault, roller and circling maneuvers of UAV have been optimized, and a method of building maneuvering flight database is introduced.The simulation results show that the proposed method is effective.