Combining　the　concept　of　energy　on　the　critical　plane,　a　multiaxial　fatigue　damage　parameter　without　any　weight　coefficient　was　proposed　and　the　effects　of　non-proportional　additional　hardening　and　mean　stress　on　fatigue　damage　can　be　reflected　more　perfectly　using　an　equivalent　form　of　shear　strain　energy.　Furthermore,　two　sets　of　experimental　data　are　employed　to　verify　the　proposed　method,　and　the　sensitiveness　to　fatigue　life　of　the　proposed　equivalent　stress　correction　factor　is　discussed　as　well.　The　results　show　that　satisfactory　and　conservative　assessments　can　be　obtained　by　the　proposed　method,　especially　under　multiaxial　irregular　loading　with　great　randomness.