Geometrical　errors　of　2D　gimbal　mount　axes　are　studied　for　laser　tracer　for　the　sake　of　realizing　rapid　detection　for　numerical　control　equipment.　The　high　precision　reference　sphere,　which　serves　as　the　reflection　unit　and　is　set　on　the　base,　avoids　the　influence　on　measurement　accuracy　caused　by　the　movements　of　rotatory　axes,　and　ensures　that　laser　tracer　owns　large　tracing　angle.　The　nonlinear　coupling　relationship　between　the　geometrical　errors　and　the　measurement　accuracy　of　laser　tracer　is　analyzed;　the　integrated　geometrical　error　model　of　2D　gimbal　mount　axes　and　laser　interferometry　system　is　established;　the　error　map　of　the　measuring　system　is　brought.　The　simulation　results　demonstrate　that　the　measurement　error　of　the　laser　tracer　is　certain　and　unique　after　the　value　and　direction　of　all　the　geometrical　errors　determined.