Abstract: In order to improve the operation and maintenance management level and patrol monitoring efficiency of substation facilities, the multi parameter online monitoring system is used to monitor and analyze the key state parameters such as visible light image, infrared thermal image, partial discharge, sound, temperature and humidity of substation equipment (such as transformer and GIS), so as to realize the abnormal early warning of substation equipment operation environment, effectively reduce the outage rate of substation equipment and improve the operation reliability of equipment.