For　the　problem　of　the　gas　fluctuation　of　the　aerostation,　the　structure　of　gas　pocket,　the　diameter　parameters　of　the　orifice,　and　the　supply　pressure　of　the　guideway　impact　on　the　gas　film　cyclone　and　fluctuation　is　researched,　The　cyclone　phenomenon　is　close　relationship　with　the　gas　fluctuation　by　comparing　the　simulation　data.　From　the　simulation　results　we　obtained　the　factors　affecting　the　gas　fluctuation　are:　The　orifice　diameter,　the　structure　shape　of　the　gas　pocket　and　gas　pressure　size.　The　pressure　size　in　the　above　factors　affects　the　gas　fluctuation　greatly,　this　was　verified　by　experiment,　and　the　law　of　the　vibration　is　good　agreement　with　the　simulation　results.　This　provides　a　theoretical　basis　to　inhibit　the　gas　film　fluctuation　of　the　aerostatic　guideway　from　the　structure　and　process　parameters,　and　to　improve　the　stability　and　machining　accuracy.　©2014　Journal　of　Mechanical　Engineering