The　measurement　of　the　gear　transmission　error　curves　effectively　is　important　for　determining　the　tested　gear＇s　geometrical　quality,　transmission　quality,　error　sources　and　noise.　This　paper　presents　the　concept　of　the　gear　integrated　error　for　analysing　the　transmission　quality　of　the　gear　pair.　The　mathematical　model　of　the　gear　pair　integrated　error　and　the　new　transmission　error　curve　were　detailedly　studied.　The　gear　pair　integrated　error　curve　(GPIEC)　reveals　the　whole　meshing　process　of　gear　pair,　especially　for　the　transition　process　of　the　teeth　related　to　the　mesh　impact.　GPIEC　provide　a　new　method　to　investigate　the　dynamic　characteristics　of　gears　and　gear　noise.