Research conclusions: Taking the design of the Taiyuan Metro South Station as an example，this paper describes the traffic streamlines used for the passenger transfer in the underground central transfer hall between the metro station and high － speed station to make all streamlines unobstructed among the high － speed railway，metro，parking area， commercial area and square，analyzes the special treatment method for the underground engineering approach of the metro across the Taiyuan South Railway Station，suggests to us shield construction for this area，and looks forward to the regional transport hub that will promote the development of downtown business district and become the typical leading model of three － dimensional development of the regional transport hub．