In　order　to　study　the　mechanical　and　deformation　properties　of　the　new　prefabricated　subway　station,　took　the　first　prefabricated　subway　station　in　Changchun　as　the　background,　based　on　the　large-scale　general　finite　element　software　ABAQUS,　the　force　transfer　and　deformation　mechanism　of　the　single-ring　structure　of　the　prefabricated　subway　station　after　assembling　into　a　ring　were　studied.Four　numerical　models　of　different　structure　types　and　steel　bars　bracing　combination　were　established.　The　mechanical,　deformation　and　joint　contact　surfaces　performances　of　the　structure　under　the　action　of　self-weight　were　compared　and　analyzed.　The　force　transfer　and　deformation　mechanism　of　the　type　of　prefabricated　subway　station　single　ring　structure　were　revealed.　The　results　show　that　the　supporting　function　of　steel　bars　could　not　be　ignored.　After　added　horizontal　steel　bars　to　the　outside　of　arch　foot,　the　maximum　Mises　stress　of　the　structure　was　reduced　by　about　40%,　the　maximum　principal　stress　was　reduced　by　about　80%,　the　maximum　horizontal　displacement　was　reduced　by　about　90%,　and　the　deflection　of　the　vault　was　reduced　by　about　80%,　the　shear　force　and　bending　moment　of　the　structure　decreased　obviously.　The　contact　state　of　the　joints　changed　obviously,　and　the　extrusion　area　ratio　of　the　other　joints　increased　significantly　except　the　D-E　joint　of　the　vault,　the　assembled　structure　basically　met　the　design　requirements　of　stable　and　reliable　force　transmission,　safe　and　controllable　deformation,　and　the　overall　self-stabilization　ability　was　significantly　improved.　The　cooperative　work　of　steel　bars　and　assembled　structure　optimized　the　transmission　path　of　single-ring　structure,　limited　the　horizontal　and　vertical　deformation　of　the　structure　effectively,　the　mechanical　and　deformation　performance　of　this　type　of　fabricated　structure　was　better　than　the　corresponding　index　of　the　cast-in-place　structure　without　the　steel　bar.　©　2020,　Editorial　Department　of　Journal　of　Southwest　Jiaotong　University.　All　right　reserved.