In order to investigate the influence of flat tail deflection Angle on the plane's landing and taxiing performance, through aerodynamic data by using the method of computational fluid dynamics reserves and by using the multibody dynamics modeling method, this paper builds up a model able to reflect the aircraft aerodynamic characteristics changes over tail peace at an Angle of attack Angle of aircraft landing run dynamics under condition of different plane landed flat tail deflection for taxiing simulation calculation. The results show that the dynamic model can well reflect the dynamic characteristics of aircraft at different horizontal tail deflection angles during landing and taxiing, and the horizontal tail leading edge downward deflection (pull rod) can effectively shorten the landing and taxiing distance.