To　accurately　research　the　hydrostatic　bearing　oil　film　performance,based　on　the　computational　fluid　dynamics　(CFD)　and　finite　difference　method,　velocity　slip　phenomenon　of　the　oil　film　micro-flow　in　hydrostatic　bearing　clearance　and　its　influence　on　bearing　performance　are　investigated.　The　sensitivity　parameters　are　defined　to　evaluate　the　impact　of　velocity　slip　on　the　bearing　performance.　Based　on　the　conventional　assumptions　of　the　oil　film　flow,　the　conventional　Reynolds　equation　is　modified　by　introducing　Navier-slip　boundary　condition.　Modified　Reynolds　equation　is　solved　by　finite　difference　method,　and　the　performance　parameters　such　as　bearing　capacity　are　deduced　using　the　method　of　trapezoidal　integral　formula.　The　parameters　of　sensitivity　are　used　to　make　a　quantitative　and　qualitative　analysis.　Results　show　that　bearing　performances　such　as　the　distribution　of　oil　film　pressure,　bearing　capacity,　dynamic　stiffness　and　oil　cavity　flow　have　a　certain　sensitivity　for　velocity　slip.　The　maximum　cavity　pressure　decreases　with　the　increase　of　slip　length,　to　a　certain　extent,　the　load　capacity　and　oil　flow　of　the　bearing　are　improved;　however,　the　dynamic　stiffness　of　the　hydrostatic　bearing　is　reduced　at　the　same　time.　The　maximum　sensitivity　of　quality　flow　to　velocity　slip　is　100%.　©,　2015,　Beijing　University　of　Technology.　All　right　reserved.