To　obtain　precision　degradation　model　of　ball　screw　mechanism(BSM),　an　accelerated　degradation　model　of　BSM　can　be　established　by　using　the　wear　characteristics.　The　accelerated　degradation　parameter　model　of　BSM　can　be　obtained　under　different　stress　levels,　through　the　design　of　the　test　device　and　the　friction　torque　value　variation　in　the　test　process,　and　statistical　analysis　of　degradation　data　was　carried　out　using　the　method　of　parameter　estimation.　At　the　same　time,　the　positioning　reverse　variation　value　of　the　BSM　can　be　calculated,　through　different　stress　conditions　of　the　measured　frictional　torque　of　BSM　degradation　data.　The　new　evaluation　method　can　be　provided　for　BSM　positioning　precision　degradation　relied　upon　the　accelerated　degradation　model.　According　to　the　characteristics　of　BSM　wearing　very　slowly,　the　accelerated　degradation　model　of　BSM　can　save　the　test　cost　and　time,　and　guide　the　design　of　the　BSM.　©　2017,　Editorial　Department　of　Journal　of　Beijing　University　of　Technology.　All　right　reserved.