Based　on　the　critical　plane　determined　by　the　weight　function　method,　two　algorithms　for　multiaxial　cycle　counting　method　are　proposed　by　modifying　the　rainflow　and　range　cycle　counting　methods.　The　proposed　two　algorithms　can　be　applied　to　multiaxial　random　loading,　and　be　suitable　to　any　critical　plane-based　fatigue　life　prediction　models,　since　the　counted　cycles　or　reversals　are　represented　by　the　start　time　and　end　time.　The　proposed　two　algorithms　are　used　to　predict　multiaxial　fatigue　life　by　the　experimental　data　of　7075-T651　aluminum　alloy,　En15R　steel　and　7050-T7451　aluminum　alloy　conducted　under　multiaxial　random　loading　in　both　high-cycle　and　low-cycle　fatigue　region.　The　life　prediction　results　are　in　good　agreement　with　the　experimental　data.