An aviation power system for use in an aircraft (100), comprising a power storage unit (21) and a drive unit, wherein the power storage unit provides power for the drive unit, and also comprises a ring-shaped power disc (23). The power disc surrounds an aircraft body (10), multiple turbine blades (231) are circumferentially provided on a surface of the power disc, and the drive unit drives the power disc to rotate; an air inlet ring (30) is formed on a top portion of the aircraft body, and an air outlet ring (40) is formed at a bottom portion of the aircraft body; when the power disc rotates, air flows between the air inlet ring and the air outlet ring. The present invention also relates to an aircraft having said aviation power system and a method for achieving level flight, vertical takeoff/landing, pitch and roll for an aircraft. As the rotation of the power disc produces an effect of drawing air and the arrangement direction of the turbine blades is fixed, air flow is drawn from the air inlet ring to the air outlet ring by means of the rotation of the power disc driven by the drive unit. The ring-shaped power disc features good dynamic balance characteristics, and the gyroscopic effect caused by the rapid rotation of the power disc allows the aircraft to achieve great stability.