Hydrostatic　turntable　has　many　advantages,　such　as　low　coefficient　of　friction,　high　load　capacity　and　long　life.　However,　due　to　the　complexity　of　load　and　deformation,　the　principle　is　still　not　clearly　known　between　uneven　distribution　of　film　thickness　and　oil　pad　carrying　capacity.　Based　on　the　infinitesimal　method,　a　modified　Reynolds　equation　which　considers　the　tilting　angle　of　turntable　is　derived.　According　to　this　formula,　the　interrelation　of　turntable　guide　surface　and　the　sealing　edge　is　described　by　an　inclination　angle.　The　equation　is　used　to　analyze　the　bearing　performance　of　oil　pad　when　the　turntable　is　tilted.　Applying　the　finite　difference　method　to　solve　the　modified　Reynolds　equation,　the　pressure　distribution　of　oil　film　is　obtained.　Finally,　the　working　parameters　of　the　oil　pad　and　the　changing　rule　of　bearing　performance　with　the　tilting　angle　are　established.　The　research　result　presented　in　this　paper　provides　theoretical　basis　for　the　bearing　capacity　analysis　and　the　oil　film　failure　determination.　©,　2015,　Tsinghua　University.　All　right　reserved.