This　paper　presents　a　non-contact　measurement　solution,　which　can　be　used　for　rapid　and　accurate　measurement　of　machinery　and　equipment　in　a　variety　of　transmission　gear　wear　or　breakage　situation.　This　scheme　is　based　on　machine　vision　technology.　Through　the　reverse　engineering　method　we　re-build　the　three-dimensional　model　of　gear　s　from　their　two-dimensional　image,　which　can　make　all　the　wear　and　damage　morphology　of　gear　surface　comprehensively　and　accurately　reappeared.　At　the　same　time　we　give　a　characterization　of　the　relevant　parameters　of　the　wear　and　tear.　Therefore,　this　method　could　solve　the　difficulty　in　terms　of　gear　wear　detection,　such　as　operability,　uncertainty　and　other　issues.　The　application　of　this　method　can　also　provide　accurate　gear　wear　data　to　predict　the　service　life　and　provide　the　essential　date　for　the　maintenance　decision.　©　(2013)　Trans　Tech　Publications　Switzerland.