Gas Insulated Switchgear (GIS) as one of the key equipments in substation, its safe and reliable operation has always been a hot spot of power system research.The partial discharge phenomenon of GIS is the main cause of equipment failure, so it is of vital significance to perceive its partial discharge effectively to ensure the stable operation of the system. This paper firstly discusses the detection method of partial discharge of GIS based on single physical sensing technology such as electric, optical, acoustic, chemical, etc. According to the current status of research at home and abroad, it is known that the sensing of single parameter still has certain limitations. On this basis, it comprehensively analyses the current multi-parameter joint sensing methods, and explains that multi-parameter sensing technology is the future development direction, which can provide detailed data support and scientific basis, and help to improve the monitoring efficiency and security of the power system.