Micro　stereovision　based　on　stereo　light　microscope(SLM)　is　used　in　micro-domains　such　as　micromanipulation,　microassembly,　micromeasurement,　etc　al.　In　this　paper,　micro　stereovision.　via　SLM　is　applied　to　the　3D　shape　reconstruction　of　microstructures.　The　model　development　for　microvision　via　SLM　is　discussed,　and　a　vision　model　that　describes　the　projection　between　2D　image　space　and　3D　object　space　is　derived.　A　pair　of　optical　paths　of　SLM　is　denoted　by　a　group　of　basic　points　and　basic　planes,　and　then　two　models　of　micro　stereovision　with　SLIM　are　derived　via　the　geometrical　projection　of　virtual　incident　rays　and　the　weak　nonlinear　phenomenon.　At　last,　experiments　are　given　for　3D　shape　reconstruction　of　microstructures　this　model.