The　performance　of　hydrostatic　turntables　is　strongly　influenced　by　the　geometry　of　oil　pads.　The　properly　designed　structure　of　oil　pads　can　reduce　the　power　consumption　of　hydrostatic　turntables　and　improves　their　service　performance.　A　structural　optimization　of　oil　pads　on　a　hydrostatic　turntable　based　on　particle　swarm　optimization　is　presented　to　improve　the　carrying　performance　and　decrease　energy　costs.　Using　the　finite　difference　method,　the　Reynolds　equation　is　resolved　to　calculate　the　pressure　distribution　and　flow　rate　in　oil　pads.　The　power　cost　of　oil　supply　is　determined　according　to　the　turntable　working　condition,　and　minimal　energy　consumption　is　set　as　the　optimal　solution.　The　geometrical　parameters　of　the　oil　pad　are　chosen　as　individual　elements　that　will　converge　to　an　optimal　result　by　using　PSO.