In order to investigate the influence of township enterprises on rural soil, We elected the Mengzhuang Industrial Zone as the representative . It was measured the content of 6 kinds of heavy metals (Cd, Ni, Cu, Pb,Cr and Zn)in the soil around the Mengzhuang industrial zone. The chemical speciation of three kinds of heavy metals was determined according to a modified BCR-sequential extraction procedure. Reference to the secondary standard of GB15618—1995, the results showed that the concentration of Cd in all samples is seriously overweight. The highest content of Cd was found 5.2mg.kg-1. The concentration of Ni exceeded bid section, up to 77.3 mg. Kg - 1; And several other heavy metals were not overweight. The chemical speciation of heavy metals showed that Cd were present at higher percentages in the acid-soluble fractions and reducible fractions, Ni is dominated by the reducible fractions and the residual fractions , Zn was found in the residual fractions. Cd were more mobile and bio-available in soil, where metals were present at higher percentages in the acid-soluble fractions (the more labile fraction).The evolutions of the soil samples by the validity of analysis and the potential ecological risk index shows that heavy metal Cd, effective state content is higher, reaching up to 81.7%, higher potential ecological harm, move into plant easily and endanger human body health.