Stress-strain　detection　of　scattering　materials,　such　as　metal　surfaces,　is　an　unavoidable　issue　during　bolt　assembly　monitoring;　conventional　strategies　of　laser　morphology　will　be　limited　by　scattering　illumination.　Contact　and　marked　measurement　have　been　considered　as　acceptable　solutions　for　long　time.　Herein,　we　implement　the　multimodal　characterization　for　bolted　joint　surface.　A　reflection　digital　holographic　microscope　(RDHM)　has　been　combined　with　laser　triangulation　measurement　for　achieving　quantitative　micro-deformation　description　of　the　connecting　region　between　bolts　and　metal　plate.　The　calibrated　laser　triangulation　instrument　is　installed　on　the　electronically　controlled　translation　platform　for　two-dimensional　scanning.　A　structure　extraction　algorithm　is　proposed　to　realize　fast　3D　reconstruction　of　the　scanned　area.　The　profiles　obtained　by　triangulation　are　used,　as　ground　truth,　to　calibrate　the　measured　reflective　holographic　morphology.　Affected　by　the　strong　scattering　from　the　metal　surface,　it　is　difficult　to　completely　characterize　the　metal　surface　by　the　single　shot　holographic　measurement　results.　But　considering　that　the　spatial　resolution　requirement　of　strain　measurement　is　low　during　bolt　installation,　holographic　measurement　will　be　an　excellent　compromise　with　high　temporal　resolution.　In　this　case,　the　triangulation　will　complement　digital　holography　well.　Therefore,　the　strategy　of　mixing　the　two　methods　will　become　a　preferred　solution　in　near　future.　©　2023　SPIE.