Metasurfaces　have　great　advantages　in　the　field　of　laser　detection　because　of　their　ability　to　generate　large　amounts　of　point　sources　or　various　diffraction　patterns.　Here,cascaded　metasurfaces　(CM)　for　generating　switchable　spatial　light　distributions　is　utilized,　which　can　be　used　for　optical　scanning　and　identifications.　The　light　distribution　is　composed　of　several　distinct　diffraction　patterns,　and　the　scanning　of　the　diffraction　space　is　realized　by　multiple　pixel-scale　alignment　strategies　between　two　pieces　of　CM.　Through　combining　Dammann　optimization　and　the　gradient　descent　method,　various　diffraction　patterns　under　different　matching　situations　can　be　guaranteed　by　phase　superposition.　Various　diffraction　conditions　with　highly　identifiable　intensity　distribution　are　guaranteed　by　using　the　optimization　method.　Such　optical　scanning　devices　based　on　CM　have　small　footprints,　high　integration,　flexible　composition,　and　stable　diffractive　combination　features.　By　manipulating　CM　to　generate　changeable　spatial　diffraction　phenomenon　may　provide　flexible　modulation　properties　to　optical　scanning,　measurement,　and　other　applications.　The　diffractive　cascaded　metasurfaces　(CM)　is　utilized　for　switchable　spatial　light　distributions　with　optical　scanning　and　identifications.　The　light　distribution　is　composed　of　several　distinct　diffraction　patterns,　and　the　scanning　of　the　diffraction　space　is　realized　by　multiple　pixel-scale　alignment　strategies　between　two　pieces　of　metasurface　based　on　Dammann　optimization　with　the　gradient　descent　method.image