In order to adapt to the development needs of subway station scale control under the new situation,starting from the idea of fine design,combined with the station technology innovation,equipment optimization,spatial integration and utilization conditions,this paper explores the feasible methods for subway station building scale reduction from multiple angles with the aim of reducing costs and increasing efficiency,and discusses the strategy for station building scale optimization,aiming to effectively compress the area of subway station and provide optimization ideas and suggestions for station design.