Abstract: The busbar is a key component of Gas Insulated Metal-Enclosed Switchgear (GIS), which undertakes the transmission of electrical energy during the normal operation of the power system and the withstanding of short-circuit currents in the event of faults.Currently,environmentally friendly GIS are mainly SF?/N? mixtures, which achieve "relatively" environmental friendliness. Howevert, clean air GIS can fundamentally eliminate the greenhouse effect, enabling harmonious coexistence between humans and the environment. This paper introduces the relevant parameters, development process, and product advantages of the 126kV clean air busbar. The rationality and reliability of the structure are verified through simulation calculation, tests. The method provides a feasible solution for the design of clean air insulated busbar unit.