Abstract: The traction power supply scheme for long and large ramp tram line is studied based on the characteristics of large natural slope, the train operation conditions of continuous climbing and descending on Line 1, which is the first phase of Lijiang Urban Comprehensive Rail Transit Project. By analyzing and calculating the serious asymmetry of the energy consumption data in the process of train climbing and descending, it is suggested to connect the contact line in the middle of each traction power supply section on the front and the down lines, and set up a parallel switch. The relationship between the distribution points of traction substations, the combination of catenary conductors and the tracking mode of coupled train is analyzed after the parallel connection of up and down catenaries on the long ramp. The results show that the close tracking of the coupled train has a great influence on the layout of the traction substations, and the adoption of chain suspension catenary can reduce the setting number of traction substations.