Compared to soil heavy metal values as 75 period of Daqing city,soil background values of Heilongjiang province and the state soil environment quality standards,the content rules of ten soil heavy metals in different landuse types were analyzed by using contrast analysis method,and the assessment of ecological risk was also studied.The results showed that the contents of soil As,Zn,Hg and Pb were the highest in industrial land,and the contents of soil Cd,Cr,Cu,Ni,Mn and V were the highest in dry land.The so...