This　paper　proposes　a　novel　optimization　method　to　improve　the　performance　of　aerostatic　spindle.　The　optimization　process　is　based　on　the　main　factors　affecting　the　load　and　stiffness　of　aerostatic　spindle,　which　are　determined　by　cross-correlation　analysis.　The　maximum　values　of　load　capacity　and　stiffness　are　obtained　from　the　relationship　between　the　optimization　function　and　the　main　influence　factors.　After　optimization,　the　corresponding　natural　frequency　has　been　improved,　which　indicates　that　the　optimization　method　proposed　in　this　paper　is　more　efficient　and　reliable　in　the　field　of　precision　machining.　The　results　will　enforce　the　industrial　application　of　aerostatic　spindle　system.