The　existing　aerostatic　spindle　dynamic　model　only　analyses　the　effects　of　mass　imbalance　and　external　load,　ignoring　the　influence　of　cutting　system　on　the　spindle　dynamic　characteristics　under　cutting　conditions.　In　this　paper,　a　5-DOFs　aerostatic　spindle　dynamic　model　is　established　considering　the　influence　of　the　micro-scale　non-linear　dynamic　performance　of　the　aerostatic　spindle　and　cutting　process　damping.　First,　an　analytical　identification　model　of　process　damping　with　blunt　circular　cutter　is　established.　Then,　the　micro-scale　dynamic　characteristics　of　the　aerostatic　spindle　are　analyzed　and　a　5-DOFs　aerostatic　spindle　dynamic　model　is　established　considering　the　influence　of　process　damping.　Finally,　the　model　is　simulated　and　the　influence　of　process　damping　on　the　dynamic　characteristics　of　aerostatic　spindle　is　analyzed.　The　simulation　results　show　that　the　process　damping　of　the　cutting　system　has　a　significant　influence　on　the　dynamic　characteristics　of　the　aerostatic　spindle.　This　study　can　provide　theoretical　guidance　for　coupling　research　of　cutting　system　and　spindle　system.　©　2022,　The　Korean　Society　of　Mechanical　Engineers　and　Springer-Verlag　GmbH　Germany,　part　of　Springer　Nature.