As　general　methods　can　no　longer　be　used　to　measure　super-large　gears,　their　manufacturing　accuracy,　performance　and　quality　can＇t　be　guaranteed.　In　this　paper,　after　introducing　the　characteristics,　measuring　requirement　and　the　state　of　arts　of　inspection　of　super-large　gears,　a　laser　tracker　and　CMM　based　measuring　technology,　proposed　by　Shi,　was　presented,　and　the　key　techniques　were　discussed.　By　taking　full　advantage　of　the　characteristics　of　a　laser　tracker　and　a　coordinate　measuring　apparatus,　the　super-large　gear＇s　positioning　problem,　which　was　to　determine　the　relationship　between　the　instrument　and　workpeice,　was　solved.　Thus,　the　gear＇s　profile,　helix,　and　topology　error　etc.　could　be　measured.　Experiments　have　been　carried　out　to　verify　the　effectiveness　of　the　method.　The　results　showed　that　the　proposed　method　could　be　used　to　measure　super-large　gears　with　the　diameters　up　to　10m.　©　(2014)　Trans　Tech　Publications,　Switzerland.