Purpose　The　purpose　of　this　paper　is　to　investigate　the　effect　of　fluid-structure　interaction　in　micro-scale　on　the　performance　of　the　hydrostatic　spindle　and　improve　the　analysis　precision　of　the　dynamic　performance　of　hydrostatic　spindle.　Design/methodology/approach　Dynamic　analysis　of　hydrostatic　spindle　before　and　after　fluid-structure　interaction　is　carried　out　according　to　stiffness　and　damping　performance　of　the　bearing,　which　demonstrates　that　the　natural　frequency　and　peak　response　of　the　spindle　are　increased　in　the　micro-scale.　Findings　It　is　concluded　from　the　simulation　and　experimental　results　that　there　is　micro-scale　effect　in　the　actual　operation　of　the　spindle　system　and　slippage　exists　in　the　oil　film　flow.　The　error　between　the　modal　detection　result　and　the　theoretical　value　is　within　10　per　cent,　which　also　verifies　the　correctness　of　the　above　conclusions.　Originality/value　This　paper　analyzes　the　changes　of　the　bearing　performance　parameters　at　macro-　and　micro-scale,　which　present　the　influence　of　the　static　and　dynamic　performance　of　the　spindle　in　the　micro-scale.