We studied the corona aging characteristics of silicone rubber composite insulator by orthogonal tests in order to study the effects of pressure

humidity and aging time on the corona aging process. Meanwhile

we constructed a corona accelerated aging test platform of silicon rubber with adjustable air pressure and humidity

and used thermally stimulated current（TSC）

scanning electron microscopy（SEM） and Fourier transform infrared spectroscopy（FTIR） to test the aged samples. The results of the range analysis showed that the changes of the pressure had the most significant influence on the trap charges

followed by the humidity and the aging time. Combined with TSC and SEM

it was found that there was more trap charges when the humidity was higher

and the humidity was more significant with the longer aging time. However

it could be seen from the TSC

SEM and FTIR tests that the results of aging states were inconsistent

and TSC tests had more influences on the corona aging characteristics caused by physical and chemical defects. Therefore

TSC results could be used as an effective criterion for the aging states.