In this paper a stepwise adsorption purification bed was introduced to be used for overflow wastewater treatment. According to the principle of natural purification of soil and paddy fields on sewage, the stepwise adsorption purification bed imitated the self-purification function of natural materials, such as defoliation，rotten wood, charcoal and the stone were processed as filler. The removal rate of the parameters, such as COD, NH3-N and TP was invested to show the treatment effect of this system. The result showed that the system had a high removal rate of the contamination in the sewage. The COD, NH3-N and TP removal rates can reach up to 80%, 85.8% and 84% respectively.