In　order　to　realize　rapid　detection　of　measurement　accuracy　of　numerical　control　equipments,　a　set　of　two-dimensional　gimbal　mount　rotatory　axes　is　designed　for　laser　tracing　measuring　system.　A　high　precision　reference　sphere　serves　as　the　reflection　unit,　and　it　is　fixed　on　the　base,　which　ensures　laser　tracing　measuring　system　perform　in　a　large　tracking　angle　and　avoids　the　influence　on　measurement　accuracy　caused　by　the　movement　of　rotatory　axes.　The　effect　of　the　main　geometric　errors　of　axes　on　measurement　accuracy　of　laser　tracing　measuring　system　is　analyzed.　The　relation　between　run-out　error　of　axes　and　measurement　accuracy　is　studied,　and　the　model　of　run-out　error　of　axes　is　simplified.　Experimental　results　show　that　measurement　error　of　the　laser　tracing　measuring　system　is　less　than　0.1　μm　when　the　run-out　error　is　within　the　range　of　±5　μm,　which　indicates　that　the　laser　tracing　measuring　system　can　reduce　the　effect　of　run-out　error.　©　2018,　Chinese　Lasers　Press.　All　right　reserved.