Abstract: In some newly built urban power transmission and transformation projects,due to the restrictions of terrain and surrounding obstacles,it is not possible to set up a busbar frame for the substation or use cable outlets,so other methods of outlet need to be adopted.According to engineering practice,a method of outletting for a 330 kV double-circuit downward-leading narrow-base steel pipe terminal tower was studied.The line passes through 330 kV pillar insulators along the tower body to the GIS electrical equipment of the substation,solving the problem of special setting of outlet door frame for indoor substations,making the project feasible as a whole,with good technical and economic effects,which can be used for reference in other similar projects.