Abstract:There are more than one hundred kinds of pollutants in road runoff. Direct discharge will pollute the surface receiving water body. At the same time, with the acceleration of urbanization, most cities have the problem of urban waterlogging. How to avoid or alleviate the pollution caused by road runoff to the water body and alleviate the problem of urban waterlogging is the research direction of road design in the new era. This article is based on the principle of ecological environmental protection and practical, on the analysis of the percolation medium for road surface runoff purification treatment effect, on the basis of combining the sponge principle of urban design, supervision of the pavement in the road design runoff infiltration drainage system design model, finally according to different forms of roadbed, respectively, put forward the corresponding ways of infiltration and drainage.