To　further　optimize　the　design　of　the　hydrostatic　bearing　system,　a　finite　element　model　for　the　oil　film　of　hydrostatic　bearing　is　established　by　applying　the　CFD　simulation　software　CFD-ACE+　based　on　engineering　practice,　and　the　numerical　simulation　is　carried　out　under　fluctuation　load.　According　to　the　results,　the　characteristics　of　the　bearing　capacity　and　stiffness　of　the　oil　film　under　fluctuation　load　are　analyzed　compared　with　the　theoretical　formula,　and　so　is　the　influence　of　the　supply　velocity　on　the　characteristics.　Results　indicate　that　the　thickness　and　bearing　capacity　of　the　oil　film　response　to　the　load　in　a　certain　delay,　which　is　affected　by　the　inlet　velocity　because　of　inertia,　the　relationship　between　the　film　bearing　capacity　and　the　thickness　does　not　coincide　when　the　load　increases　and　decreases,　and　the　stiffness　is　the　most　unstable　when　the　load　reaches　the　maximum　and　minimum.