In order to study the influence of different factors on the permeability of asphalt mixture， the influences of factors including water pressure， temperature， void content， axi-al pressure and maximum nominal part ical size on the permeability of asphalt mixture were comparatively researched by testing the permeability coefficient of two kinds of asphalt mix-ture specimens(AC-13andAC-20) with different porosity at different conditions， such as temperature， water pressure and axial pressure.The experimental results show that the see page volume increases with the increase of water pressure， but the increasing range de-creases gradually.The void ratio has the greatest influence on the permeability of asphalt mixture.The greater the void ratio， the larger the permeability coefficient， which indirectly proves that 8%of the porosity is the turningpoint of the rapid increase of the permeability of asphalt pavement.For different asphalt mixtures， the larger the maximum nominal part i-cle size， the greater the coefficient of permeability.For the same asphalt mixture， the higher the test temperature， the greater the axial pressure， and the greater the coefficient of per-me ability.Therefore， we should strictly control the compaction quality of asphalt pavement construction， paying more attention to the adverse effects of high temperature and heavy load on Asphalt Pavement in rainy areas.