With the rapid development of wind power generation, wind generator has become an important part of the generator sets. The reliability of the generator insulation system is of great significance to improving the reliability of the entire wind generator set. Compared with ordinary generators, wind generators introduce converter and the insulation system bears different stresses such as high-frequency pulse voltage and partial discharge. 〖JP2〗At the same time, the operating environment of wind generators is more complicated, so that the insulation system is affected by factors including high humidity, high temperature difference, heavy salt spray, etc. during long-term operation. In response to actual operating requirements, the reliability evaluation methods of wind generator insulation systems are introduced from different dimensions, including longterm heat resistance, electrical stress durability and environmental reliability. Various methods are analyzed, so that the complete machine manufacturer can choose the appropriate evaluation method according to the actual demand and improve the reliability of the wind generator products.