The paper researched on the soils of heavy metals pollution and correlation in Daqing city, Heilongjiang Province through sampling outside and analysis indoor. The main methods are: glass-electrodes method, potassium dichromate method and statistical method. The result shows that Cd is the major contribution factor in Daqing city. Correlation doesn't exist among heavy metal elements as well as heavy metal elements and physics-chemical nature, both in pastoral areas and in oil extraction area. As to industrial area, correlation exists between Pb and Cd, and also between Zn and organic matter. In living area, 6 pairs of heavy metal elements are correlative. It is manmade activity that led to the situation.

This paper researched on the soils in Daqing city for example, based on the field survey datas and applying single factor index and the potential ecological risk index introduced by a scholar in Sweden.The results show that steep natural pond area is contaminated slightly, and pastoral area is contaminated lightly;and that industrial district, living area, oil extraction area, the nature reserved all suffer medium contamination.Cd is the main contribution.It has already bad effects on ecological environment of the city.