With the extensive extension of high-speed railway in China

the situation that the DC grounding electrode is close to the high-speed railway often occurs. The grounding current of DC grounding electrode may affect the integrated grounding system of high-speed railway. In order to evaluate the influence of DC grounding electrode on the integrated grounding system of high-speed railway

the analysis model of DC current distribution in highspeed railway integrated grounding system is setup in this paper. The distribution of axial DC current and leakage current density distribution per unit length along the high-speed railway is obtained. The influence mechanism of DC grounding electrode on the electric corrosion of high-speed railway integrated grounding system is explained. The influence of such factors as soil resistivity and DC grounding electrode distance on the degree of electric corrosion is analyzed. It is shown by the study result that the DC grounding electrode has certain electrical corrosion impact on the integrated grounding system of high-speed railways. Attention should be paid to the electric corrosion of highspeed railway lines which are close to the DC grounding electrode and located in the area with high soil resistivity.