In　this　paper,　a　3D　surface　topography　model　for　ultra-precision　turning　is　proposed,　in　which　the　coupling　effect　of　turning　dynamics　and　dynamics　of　the　aerostatic　spindle　in　microscale　is　considered.　Firstly,　the　identification　model　of　the　tool-workpiece　interference　area　is　established　by　the　analytical　method,　and　then　the　accurate　process　damping　coefficient　is　obtained.　Meanwhile,　considering　the　influence　of　the　dynamic　characteristics　of　the　aerostatic　spindle　on　the　formation　of　the　workpiece　surface　morphology,　a　5-DOF　aerostatic　spindle　dynamic　model　is　established　under　the　influence　of　the　process　damping　effect　in　the　cutting　process　and　the　microscale　effect　of　the　gas　film.　Then,　based　on　the　dynamic　model　of　turning　and　aerostatic　spindle,　the　surface　topography　model　of　ultra-precision　turning　is　established.　The　effects　of　spindle　speed,　cutting　width,　and　feed　rate　on　the　surface　topography　of　ultra-precision　turning　are　also　analyzed.　Finally,　the　cutting　experiment　is　carried　out,　the　surface　morphology　obtained　from　the　simulation　and　experiment　is　characterized　by　three-dimensional　surface　roughness　parameters,　and　the　error　between　the　simulation　and　experimental　results　is　analyzed.　The　results　show　that　the　3D　surface　morphology　model　built　in　this　paper　matches　the　experimental　results　better,　which　proves　the　effectiveness　of　the　model.