Abstract: Based on the problem annual attenuation rate of PV modules due to natural aging, 32 mainstream PV companies outdoor aging tests were conducted in the outdoor aging base of the CTC Group in Hainan Province. Comparing and analyzing the related data obtained by testing the natural annual attenuation rate and power generation amount, it was obtained that the law of decay rate of mainstream photovoltaic modules in China and The performance of crystalline silicon PV modules under different irradiations tends to be consistent.