Based　on　the　strain-based　multiaxial　fatigue　models,　a　method　was　proposed　to　calculate　multiaxial　fatigue　damage.　If　the　calculated　fatigue　damage　by　the　shear　strain　parameter　is　less　than　that　by　the　axial　strain　parameter,　an　axial　strain-based　multiaxial　fatigue　model　was　used　to　calculate　fatigue　damage,　or　else　a　shear　strain-based　multiaxial　fatigue　model　was　used　to　calculate　fatigue　damage.　The　proposed　multiaxial　fatigue　damage　calculation　method　was　verified　by　some　experimental　data　under　tension-torsion　constant　amplitude　loading.　The　results　showed　that　a　good　agreement　is　demonstrated　with　experimental　data.　(C)　2010　Elsevier　Ltd.　All　rights　reserved.