Abstract: Individual and combined pollution characteristics of heavy metal elements（ Pb, Zn, Cu, As and Cr) of surface soil（0 ~ 20 cm) in Baosteel Group Tailing Dam and its neighboring regions were investigated by utilizing Combined Pollution Assessment Method(CPAM) , Hakanson Latent Ecological Risk Index Method（HLERIM) and quantitative determination of latent ecological risk degree.The key pollutant and latent ecological risk factor was carried out.The results indicated that the heavy metal pollution degree varies in Baosteel Group Tailing Dam and its neighboring regions.It also showed the latent ecological risk indexes can be seen as followings from high to low：Pb, As, Cu, Cr ,Zn.Among them, the pollution risk index of Pb is the highest and then As.

Key words: Tailing Dam, Heavy metal, Latent ecological risk assessment, Combined pollution