Abstract: The tension in urban construction land has accelerated the development of underground space.Deep foundation pit support in protecting underground space construction has gradually been taken seriously.They were widely used in foundation pit support due to the advantages of double row pile having large lateral stiffness,small lateral deformation and with no need for support inside.Based on a case project in Nanjing,this paper introduces the design,calculation analysis and construction attention points of double row pile,which can provide reference for the application of double row pile in this area in the future.