Maneuver flight is inevitable for a fighter in combating.In a maneuver flight, the engine rotor usually suffers additional centrifugal force and gyroscopic moment, va~.ing along with the flying states and time.which results in additional flexing distortion, possibly with severe vibration, harmful to the rotor system's stability.Therefore.the maneuver flight influence is a crucial problem to the rotor system and must be taken into consideration during the engine design and the manufacture.