Abstract: Objective: Currently, most research on metro interchange stations focus on station internal facility arrangement, management measures and signage systems, ignoring the spatial bottleneck issues and underground space wastage caused by the uneven area allocation of the spatial units that are composing the interchange station itself, thus an indepth research on this topic needs to be carried out. Method: Taking eight Ttype interchange stations in Xi’an Metro line network as research objects, the basic concept of interchange station ′spaceflow′ efficiency matching ability is proposed, and the Ttype interchange station internal space is divided into five compositional units; by decomposing the interchange passenger flow lines and simplifying the space for the Ttype interchange station, a spatial model of typical Ttype interchange station in Xi’an Metro is established through data statistics; based on two evaluation indexes of the area proportion of each compositional unit and the average width of pedestrian passages, the ′spaceflow′ efficiency matching ability of typical Ttype interchange station under the two test working conditions of designdemand and flexibledemand are simulated and analyzed using AnyLogic software. The simulation analysis shows that there is excess area in the interchange passage while insufficient area and width in the vertical traffic area, resulting in a mismatch in the ′spaceflow′ efficiency of the compositional units in the existing typical Ttype interchange station. Eight optimization solutions for the typical Ttype interchange station spatial layout original scheme are proposed and compared for selection. Result & Conclusion: Optimization solution 6 is the optimal; compared to the original scheme, solution 6 increases the average speed of incoming interchange passenger flow by 3.3% and that of outgoing interchange passenger flow by 4.2% under designdemand working condition; under flexibledemand working condition, the average speed of incoming interchange passenger flow is increased by 3.0% and that of outgoing interchange passenger flow by 2.1%. Under the premises of keeping the same total floor area of interchange station building, reducing the proportion of platform floor nonpaying area reasonably and increasing the width of vertical traffic area pedestrian passages can elevate passenger throughput efficiency significantly.