The composite suspension insulator has the advantages of light weight and high mechanical and electrical strength, so it can be used for the reconstruction of urban networks and the erection of compact overhead lines. In particular, synthetic insulators have good anti-pollution performance and are particularly suitable for use in particularly polluted areas, so as to effectively improve the reliability of line operation and reduce the maintenance workload of the line. . Compared with porcelain or glass insulators, the excellent antifouling performance of composite suspension insulators is unquestionable, but the lightning resistance performance has two factors.