In this dissertation, we take the typical sewage irrigation area as research objects and the area irrigated by underground water as control area, gathering the soil samples in different area and then we may have some comparison with the heavy metals content of As, Pb, Cd, Hg and Cr. Single factor Index and integrated pollution index of Nemero was used to evaluate the contamination of soil heavy metals, Potential ecological risk index of Hakanson was used to evaluate the potential ecological risk of soil heavy metals in the sewage irrigation area.