An　improved　high-cycle　multiaxial　fatigue　criterion　based　on　the　critical　plane　was　proposed　in　this　paper.　The　critical　plane　was　defined　as　the　plane　of　maximum　shear　stress　(MSS)　in　the　proposed　multiaxial　fatigue　criterion,　which　is　different　from　the　traditional　critical　plane　based　on　the　MSS　amplitude.　The　proposed　criterion　was　extended　as　a　fatigue　life　prediction　model　that　can　be　applicable　for　ductile　and　brittle　materials.　The　fatigue　life　prediction　model　based　on　the　proposed　high-cycle　multiaxial　fatigue　criterion　was　validated　with　experimental　results　obtained　from　the　test　of　7075-T651　aluminum　alloy　and　some　references.