Based　on　the　Hertz　contact　theory,　a　mechanical　model　of　linear　ball　guideways　was　built　to　study　the　wear　rule　and　accuracy　degradation　of　linear　ball　guideways.　The　contact　area　between　the　ball　and　the　slider＇s　raceway　was　characterized　by　the　fractal　function,　and　the　raceway＇s　fractal　parameters　were　obtained　by　using　the　structure　function　analysis　method.　Under　the　considering　of　the　lubrication　state　between　the　ball　and　the　slider＇s　raceway,　the　asperities　load　capacity　was　obtained　by　using　the　fractal　contact　model.　The　wear　between　the　ball　and　slider＇s　raceway　was　analyzed　through　the　adhesive　wear　theory,　and　then,　the　fractal　wear　model　of　linear　ball　guideways　was　established　with　the　creep　theory.　Finally,　the　simulation　analysis　for　a　certain　type　of　the　linearball　guideway　was　conducted,　and　the　wear　rules　and　accuracy　degradation　of　the　linearball　guideway　under　different　loads　and　running　distance　were　obtained　by　the　calculation　simulation.　©　2016,　Inst.　of　Scientific　and　Technical　Information　of　China.　All　right　reserved.