Shape　memory　polymers　(SMPs)　have　gained　much　attention　in　biomedical　fields　due　to　their　good　biocompatibility　and　biodegradability.　Researches　have　validated　the　feasibility　of　shape　memory　polymer　stent　in　treatment　of　vascular　blockage.　Nevertheless,　the　actual　application　of　SMP　stents　is　still　in　infancy.　To　improve　the　mechanical　performance　of　SMP　stent,　a　new　geometric　model　based　on　metamaterial　is　proposed　in　this　study.　To　verify　the　feasibility　and　mechanical　behavior　of　this　type　of　stent,　buckling　analysis,　and　in　vivo　expansion　performance　of　SMP　stent　are　simulated.　Numerical　results　exhibit　that　stent　of　a　smaller　radius　behaves　a　higher　critical　buckling　load　and　smaller　buckling　displacement.　Besides,　a　smaller　contact　area　with　vessel　and　smaller　implanted　stress　are　observed　compared　with　traditional　stents.　This　suggests　that　this　SMP　stent　attributes　to　a　reduced　vascular　restenosis.　To　characterize　the　radial　strength　of　SMP　stent,　an　analytical　solution　is　derived　by　the　assumption　that　the　deformation　of　stent　is　mainly　composed　of　bending　and　stretch.　The　radial　strength　of　SMP　stent　is　assessed　in　form　of　radial　force.　Analytical　results　reveal　that　radial　strength　is　depended　on　the　radius　of　stent　and　periodic　numbers　of　unit　cell　in　circumferential　direction.　©　2020　by　the　authors.