In order to investigate the dynamic axle load conversion in complex conditions，the dynamic response of as-phalt pavement subjected to moving load is analyzed，the validity of the numerical calculation and the influence of vehi-cle characteristics are discussed，and a conversion formula of the dynamic axle load is set up． Then，based on the two-dimension Lamb problem，the effectiveness of the numerical calculation is verified，and a three-dimension dynamic nu-merical model of asphalt pavement with rigid base is established to analyze the effects of vehicle speed，road surface fric-tion coefficient and axle load． The results show that，when the vehicle moves at a constant speed，both the axle load and the road surface friction coefficient remarkably influence the dynamic response of pavement; and that the conversion co-efficient of the dynamic axle load considering the friction coefficient is significantly greater than that of the static axle
load． Moreover，it is found that the three-dimension finite element model，which takes into consideration various affec-
ting factors of the vehicle and the asphalt pavement，accords well with the actual stress state of asphalt pavement struc-
ture; and that the presented conversion formula is feasible in improving the current design specifications．