In　this　paper,　load　controlled　uniaxial,　pure　torsion,　constant　and　variable　amplitude　tension　torsion　tests　on　7075-T651　aluminum　alloy　tubular　specimens　were　conducted.　According　to　the　analysis　of　the　experimental　data　obtained,　a　multiaxial　high-cycle　fatigue　life　prediction　model,　based　on　the　critical　plane　method　and　considering　mean　shear　stress　effect,　is　proposed.　The　critical　plane　is　proposed　to　be　determined　by　a　weight　average,　which　is　based　on　the　variation　of　the　maximum　shear　stress.　The　estimated　fatigue　lives　obtained　by　applying　the　proposed　model,　for　the　fatigue　limits　related　to　10(6),　2　x　10(6)　and　10(7)　cycles,　are　compared.　The　results　demonstrate　that　the　proposed　model　shows　a　good　predictive　capability.