The　use　of　CFD-ACE　for　numerical　simulation　of　hydrostatic　bearing　is　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　is　analyzed　compared　with　the　theoretical　formula.　The　result　indicates　that　the　film　thickness,　bearing　capacity　and　stiffness　have　different　effects　under　Fluctuations　in　different　frequency　load.　This　research　provides　a　basis　for　the　reliability　design　of　the　hydrostatic　bearing　system.