Aiming　at　the　problem　of　3D　surface　reconstruction　of　small　height　objects,　a　method　based　on　the　scanning　principle　with　thin　structured　light　is　proposed.　The　laser　fringe　is　produced　by　a　laser　light　source.　It　scans　the　surface　of　small　height　object　under　the　control　of　a　precise　motion　control　system,　and　is　integrated　with　a　stereo　light　microscope　and　two　cameras　to　form　a　complete　structured　light　profilometry　system.　This　method　is　very　suitable　for　3D　surface　reconstruction　of　small　height　objects.　In　order　to　deal　with　the　phenomenon　of　＂cracking＂　and　local　uneven　brightness　in　microscope　fringe　image,　the　fringe　image　sequence　is　captured　under　different　camera　exposure　parameters,　and　the　quality　of　fringe　image　is　improved　by　image　fusion.　The　location　of　pixels　on　the　center　line　of　laser　stripes　is　detected　by　the　Loess　local　second-order　fitting　method,　and　the　positions　of　these　pixels　are　smoothed　and　predicted　by　using　the　Lowess　local　linear　fitting　method.　The　deformation　of　the　laser　stripe　center　curve　is　calculated　by　constructing　a　baseline,　and　the　3D　surface　reconstruction　of　the　object　with　small　height　is　realized　in　the　image　space.　Taking　the　small　characters　on　the　surface　of　Chinese　coins　and　human　hair　as　test　samples,　their　3D　surfaces　are　constructed　by　using　the　method　proposed　in　this　paper.　The　reconstructed　3D　surface　shapes　are　highly　consistent　with　the　real　3D　surface　shapes　of　objects.