Abstract:The vehicle base is one of the important facilities of the subway. Taking the access lines of the high-tech parking lot of Nanchang Metro Line 3 as the research background, the connection scheme and distribution form of the access lines at the intermediate station of the line are studied by combining the function of receiving and sending vehicle on the entrance line, the function of turning back at the station, the function of transferring at the station, the difficulty of implementing the project and the cost of the project. Three connection schemes of entrance line are given and must be selected. It is recommenced that Scheme 1 is taken as the final scheme, which has strong function of terminal turning back, less difficulty in project implementation and lowest comprehensive cost.