The complex ecological-biogeochemical investigation was conducted in the districts of industrial complex «Severonikel» and in Monchegorsk-city (Kola Peninsula). In the first part of the article the peculiarity of chemical composition of soils in Monchegorsk-city and their pollution are considered. The contents of mobile forms Cu, Zn, Ni, Co, Fe, Mn, Cr, Cd, Pb that were extracted by ammonia-acetate buffer and SO ₄ ^-2 in soils are determined. The estimation of heavy metal pollution degree is made. The index of total pollution of soils is calculated.