Abstract: Biochar is the product of thermal degradation of waste biomass under the limit-oxygen condition，which is made up of abundant carbon． Biochar has the efficient absorption of heavy metal due to its precise pore structure and unique chemical properties，so that it can influence the transfer of heavy metal． It was summarized some characteristics of biochar，the mechanism of absorption and its immobilizing effect on heavy metal in the soil． At last，the future research direction in the environmental amendment was suggested．