Abstract:With the construction and development of urban core business districts (CBD) in China, how to rationally allocate the vacant parking spaces in various garages and maximize the utilization of parking resources is an urgent problem to solve. In the study on the design of Nanjing Jiangbei New District Central Area Underground Space Phase I Project, a circular shared passage for the underground cars is designed, and the underground parking resources are connected and integrated in order to improve the service efficiency of the garage. At the same time, the entrances and exits connected to the municipal roads are used to quickly divert some car traffic entering and exiting the underground garage, thereby reducing the road traffic pressure on the ground and improving the traffic service quality of CBD. Two design schemes of "one-ring two-connection" ring scheme and "one-line six-connection" tree-shaped scheme are proposed, and compared and analyzed from the aspects of traffic function, connected land number, garage sharing engineering, implementation process and engineering cost. The analysis result shows that the "one-ring two-connection" ring scheme can more effectively connect and integrate the underground parking resource in the area and improve the service efficiency of garage.