Nonlinear aerodynamic models and flight dynamic models of the flight test prototype with tilt-rotor were developed by calculating the airframe forces and moments of each component

including rotors

wings

nacelles

fuselage

horizontal tail and vertical tail.Its control characteristics on helicopter mode

the conversion mode and the airplane mode were researched.A manipulation assignment strategy of full-mode flight was presented based on the results of the trim value and the small perturbation linearized model.A difficult problem

involving aerodynamic structural components change and the manipulation redundancy with the change of flight mode in the process of flight control was overcome.A unified flight controller was designed with the help of the manipulation assignment strategy

without need to design a controller for different flight modes.The design difficulty of the flight controller was effectively reduced.Simulation results demonstrate the credibility of the tilt-rotor aircraft flight dynamics model and the effectiveness of the manipulation assignment strategy.