Objective to verify the influence of graphite based flexible grounding body on Corrosion Behavior of metal down lead in graphite based flexible grounding device. Methods three kinds of accelerated corrosion tests were carried out to simulate soil coating, strong electrolyte soil current and other types of accelerated corrosion tests after connecting galvanized sheet, copper metal and 304 stainless steel with graphite material. The influence of different accelerated corrosion test types on Corrosion Behavior of galvanized sheet, copper and stainless steel was studied by weight loss method, XRD and polarization curve. Results the order of corrosion resistance was 304 stainless steel > copper metal > galvanized steel. The increase of sulfate ion concentration would accelerate the corrosion of graphite grounding materials to metal grounding materials. Conclusion 304 stainless steel or 304 stainless steel and graphite composite material is preferred for down lead of graphite based flexible grounding device, the corrosion products on the surface of galvanized steel have obvious layered structure, the main corrosion products of inner layer are Zn5(OH)8Cl2H2O, Fe4(OH)10SO4, and The outer corrosion products have high oxygen content and loose texture, mainly SiO4 and Zn.