Abstract: This paper sampled soil around 40 different geographical substation in Gansu province, and tested the seven parameters of soil samples in the laboratory, obtained the distribution range of soil parameters in Gansu province, and analyzed the key factors affecting the corrosion rate of Q235 steel in Gansu province, established the prediction model of Q235 steel in Gansu province, which is of great practical significance to ensure the safety of buried metal facilities in Gansu province substation and avoid safety accidents caused by corrosion of underground facilities.