A　thin-structured　light　projection　system　with　simple　setup　is　proposed　and　applied　to　small-height　measurement.　In　this　system,　the　design　of　structured　light　pattern　is　carried　out　on　the　computer.　The　structure,　color,　geometric　dimension,　motion　mode,　projection　brightness,　contrast,　and　other　attributes　of　the　pattern　can　be　edited　easily.　The　optical　system　with　zoom　function　is　designed,　which　can　output　thin-structured-light　fringe　with　a　minimum　width　of　10　mu　m.　The　camera　and　microscope　are　used　to　construct　a　vision　system,　which　is　used　to　capture　the　pattern　of　structured　light.　The　three-dimensional　(3D)　shape　reconstruction　is　realized　by　analyzing　the　pattern　of　structured　light.　The　results　show　that　this　system　can　project　a　small　width　of　thin-structured　light　pattern,　which　is　very　suitable　for　3D　shape　reconstruction　of　microscopic　objects　with　the　small-height　of　tens　of　microns　to　hundreds　of　microns.