To　numerically　simulate　the　stress-strain　response　of　the　components　under　multiaxial　cyclic　loading,　an　elastoplastic　finite　element　analysis　was　adopted　to　thin　tubular　specimens　under　multiaxial　proportional　and　nonproportional　tension/torsion　loading　at　high　temperature.　Finite　element　modeling　was　founded　by　ANSYS　FEA　software.　Elastoplastic　material　property　under　high　temperature　was　described　by　the　von　Mises　yield　criterion　and　the　multilinear　kinematic　hardening　rule　and　uniaxial　cyclic　stress-strain　data　under　high　temperature.　Triangle　waves　were　used　in　the　proportional　and　nonproportiaonal　loading.　Tension-torsion　loading　with　strain　control　was　carried　out　by　applying　the　axial　and　circular　displacement　on　one　end　of　the　specimen　in　the　cylindrical　coordinate　system.　It　has　a　good　agreement　between　postprocessing　results　of　the　thin　tubular　specimens　and　the　test　results.