A　total　life　prediction　method　based　on　short　crack　propagation　considering　additional　damage　from　nonproportional　loading　is　proposed　under　multiaxial　fatigue　loading.　Firstly,　a　new　calculation　method　of　equivalent　stress　range　is　proposed　to　consider　the　effect　of　shear　stress　on　crack　propagation　under　tensile　or　compressive　stress,　then　it　is　further　modified　to　consider　the　additional　damage.　Combined　with　Paris　formula　and　crack　closure　correction,　a　total　life　prediction　method　is　proposed.　The　life　results　were　used　to　verify　the　proposed　method　for　two　materials,　which　showed　that　most　errors　are　within　a　factor　of　3.