Abstract: 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 yon 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 controlling was carried out by applying the axial and circular displacement on one end of the specimen in the cylindrical coordinate system.It had a good agreement between postprocessing results of the thin tubular specimens and the test results.