Abstract: Aiming at the layout of double bus connection electrical equipment in AIS substation, overcoming the shortcomings of the traditional design concept, three optimization design schemes are proposed without increasing the area of the substation. The voltage transformer and lightning arrester are adopted in the common foundation structure, the position and layout of the circuit breaker, cable trench and terminal box are changed, and the structural form of the disconnector is optimized to facilitate the use of large-scale operation vehicles (aerial operation and crane), It can meet the safety distance requirements specified in the safety regulations during the lifting and maintenance of electrical equipment, greatly reduce the operation safety risk and improve the operation efficiency.