To improve the modeling precision of the tilt rotor aircraft, the rotor induce velocity model is set up by using the generalized dynamic wake theory,and then a rotor erodynamic force calculation model is established. Moreover, considering the effect of the rotor wake on the wing, a wing aerodynamic model is established, and considering the effect of the rotor wake and wing interference on other lifting surfaces, the corresponding aerodynamic calculation model is also established. The XV-15 tilt rotor aircraft is taken as an example to verify the modeling method.The simulation results show that the flight dynamics model can well reflect the physical properties of the aircraft and can be applied to flight dynamics research.