The　numerical　simulation　of　the　hydrostatic　bearing　of　the　fluctuating　load　is　carried　out　by　Ansys　cfx.　The　variation　law　of　the　oil　film　thickness　with　the　load　is　obtained　and　compared　with　the　static　formula.　It　reveals　the　influence　of　periodic　variation　of　the　load　displacement　interface　table.　The　results　show　that　under　the　fluctuating　load,　the　oil　film　thickness,　the　bearing　capacity　and　the　dynamic　stiffness　are　changed　to　some　extent,　which　also　provides　the　important　basis　for　the　reliability　design　of　the　hydrostatic　bearing.