The domestic high-quality 35kV insulation material is adopted, the Swiss zhongbach on-line polarization measuring equipment is introduced, and the full dry crosslinking production line is adopted. The insulation eccentricity is controlled to be ¡Ü 5%, which is better than the stipulated requirements of ¡Ü 15% in national standard GB/T 12706-2020. The product has been granted a utility model patent, and the product technology has reached the international leading level. It is widely used in nearly ten domestic well-known subway lines such as Guangzhou Metro Knowledge City branch line, line 14 and line 21.