Abstract: In a typical sewage irrigation area, Xinfu District, the risk assessment of heavy metal pollution was carried out and the content and morphology of heavy metals in the soil profile were analyzed, in order to provide reference for the remediation, environmental control and scientific irrigation of heavy metal contaminated soil in sewage irrigation area.The results showed that long-term sewage irrigation has caused Cu, Zn, Ni, Cr, Pb, Cd, Hg and As to accumulate to varying degrees relative to the background valuein the surface soil of the farmland, which were 1.21,0.71,1.23,1.73,1.38,4.62,3.59,1.00 times, only the average content of Zn was lower than the background value of the soil.Taking the second-level limit value of the national soil environmental quality standard as the pollution evaluation threshold, of the 25 sampling spots, the comprehensive soil pollution index of 2 sampling points was higher than 0.7,which was a warning level, and the others were all safe levels.Among the eight heavy metal elements, the top soil had the highest contents of Cu, Zn, Cd and As, the highest contents of Cr and Hg were between 80 cm and 100 cm, and there was no significant difference between Ni and Pb in different soils.Cr and Zn mainly exist in the form of residue, Cu, Ni, Cd, As mainly exist in the form of residue and organic matter, Pb mainly exists in the form of iron manganese oxide and organic matter, and Hg exists in the form of residue and exchangeable.Mainly, the risk of Hg migration was high.