When the speed of rotor 1 and rotor 3 increases, the speed of rotor 2 and rotor 4 decreases, resulting in positive rolling motion; when the speed of rotor 3 and rotor 4 increases, the speed of rotor 1 and rotor 2 decreases, the speed of rotor 1 and rotor 4 increases, the speed of rotor 2 and rotor 3 decreases, resulting in forward yaw motion; when the speed of four rotors increases (decreases), the UAV will generate vertical motion Move up (down). When the UAV is pitching, the rotating speed of rotor 3 and rotor 4 is greater than that of rotor 1 and rotor 2, so that the moment generated by the front and rear rotors is different, forming the pitching angle θ, generating the acceleration in the horizontal direction, and realizing the acceleration of forward flight. The pitching moment M of UAV is obtained from the moment formula M = fl,