The　measurement　of　holistic　gear　deviations　(HGD)　is　a　fast-developing　field　of　gear　measurement　technology　in　recent　years.　Line　laser　measurement　is　an　effective　approach　to　measure　the　HGD,　and　is　beginning　to　be　applied.　However,　compared　with　the　mature　conventional　gear　measurement　based　on　“point”　and　“line”　measurement,　the　holistic　gear　deviations　measurement　is　imperfect,　especially　in　acquisition,　evaluation　and　utilization.　This　paper　introduces　the　line　laser　measurement　model　of　HGD　and　puts　forward　the　solutions　to　the　problems　such　as　the　determination　of　the　position　and　attitude　parameters　of　the　laser　sensor,　the　influence　of　the　incident　angle　of　the　measuring　light,　and　the　occlusion　of　the　adjacent　gear　teeth　in　the　measurement.　The　representation　method　of　the　three-dimensional　deviations　of　the　tooth　flank　is　illustrated.　According　to　the　HGD,　a　unified　model　for　calculating　the　elemental　deviations　of　the　gear,　such　as　the　involute　and　helix,　is　found.　The　HGD　evaluation　system　is　established　by　means　of　the　statistical　analysis　method.　The　full　use　of　the　HGD　is　explored　from　two　aspects　of　gear　process　error　analysis　and　gear　performance　prediction,　including　tooth　flank　twist　analysis,　calculation　of　gear　integrated　error　(GIE)　and　transmission　error　(TE),　matching　method　of　large　batch　of　gears,　etc.　The　analysis　system　of　HGD　is　built　on　the　cloud　platform.　The　measurement,　evaluation　and　utilization　of　HGD　are　the　key　technologies　of　the　next　generation　gear　measurement.　©　2025