The compatibility of aircraft landing gear and pavement is of great significance to the ground motion ability of aircraft. This paper calculates the landing gear load and tire load distribution under different working conditions for a large aircraft. The Portland Cement Association method based on Westgard laminate theory and the United States Army Corps of Engineers method based on California bearing ratio are used to calculate. The influence of the landing conditions, ground mobility, tire number, tire deflation and track widths on the aircraft classification number(ACN) is analyzed. The aircraft floatability under rigid and flexible pavement is analyzed. The increased tire load and uneven load distribution caused by vertical overload and tire deflation can weaken the floatability of aircraft to varying degrees, especially during turning and landing conditions with tail sinking. Therefore, they need to be limited. Increasing the number of tires and the distance between them can improve the floatability, but the structural design, strength margin and other factors should also be taken into consideration to optimize the design of trolley type landing gear.