Gas insulated metal-enclosed switchgear is a whole by optimally design and organically combining the primary equipment except for the transformer in a substation, including circuit breakers, disconnectors, earthing switches, voltage transformers, current transformers, surge arresters, busbars, cable terminals, lead-in and lead-out bushings, etc. The product is suitable for power system with AC 50Hz and 220kV. It has a compact structure, small floor space, high reliability, flexible configuration, convenient installation, strong security and good ability to adapt to the circumstance. The maintenance workload is very small and the maintenance interval of main components are not less than 20 years.