The pollution situation of heavy metals in soil of landfill site and its surrounding was evaluated with the method of potential ecological risk index proposed by Hakanson. The evaluation factor was expanded and the toxic coefficients and reference values of the various heavy metals were ascertained. The results showed that the risk level of Hg was more serious, followed by Cd， As， Ni， Cu， Pb， Co， Cr， Mn and Zn in the order. This study has certain guiding significance for risk assessment and ecological restoration of contaminated sites.