Geographic information system(GIS) combined with geostatistics was applied to reveal the spatial variability of heavy metals and its affecting factors including Cu

Zn

Pb

Ni and Cd in Shuangcheng of Heilongjiang province.The results showed that Zn

Ni and Cd had a strong spatial correlation

which were affected by intrinsic characteristics of soils

whereas the spatial correlation of Cu and Pb were moderate

indicating that they were affected by intrinsic properties of soil and random factors together.The ranges of Cd

Pb were smaller than that of Cu

Zn and Ni

indicating that the 3 former heavy metals were affected by smaller range factors.The spatial variability characters of heavy metals in studied area soils were as follows.The contents of Cu and Ni decreased from east to west

and contents of Pb decreased from south to north

whereas the distribution of Zn was block-like and Cd was insular.Intrinsic and random factors were the main factors of driving forces of the heavy metals'distributions.Intrinsic factors included soil types

the characteristics of soils

elevation and so on.Random factors included towns

roads

factories and so on.