This　study　explores　the　elastic　local　buckling　behavior　of　double-skinned　ultra-high-performance　concrete　(DS-UHPC)　composite　plates,　focusing　on　the　effects　of　interfacial　shear　slip.　A　theoretical　model,　based　on　the　first-order　shear　deformation　theory　for　sandwich　plates,　was　developed　to　predict　the　elastic　local　buckling　behavior　of　these　composite　plates.　An　analytical　solution　for　the　elastic　buckling　coefficient　under　uniform　compression　with　a　simply　supported　boundary　condition　was　derived.　The　results　reveal　that　interfacial　shear　stiffness　and　the　proportion　of　cross-sectional　steel　content　significantly　affect　the　elastic　buckling　coefficient.　Specifically,　lower　interfacial　shear　stiffness　and　higher　steel　content　proportion　result　in　a　decreased　buckling　coefficient,　while　increasing　interfacial　shear　stiffness　reduces　the　sensitivity　of　the　buckling　coefficient　to　variations　in　steel　content　proportion.　Finite　element　models　were　established　and　validated　against　previous　studies　on　the　buckling　performance　of　single-layer　steel-concrete　composite　plates　and　classical　solutions　of　buckling　coefficients　without　interfacial　shear　slip.　Semi-analytical　solutions　for　the　elastic　buckling　coefficient　under　various　boundary　conditions　were　also　developed　through　a　comprehensive　set　of　finite　element　results.　Building　on　these　findings,　a　design　procedure　for　DS-UHPC　composite　plates　is　proposed,　emphasizing　the　optimization　of　interfacial　connectors　to　minimize　shear　slip　effects　on　local　buckling.　This　procedure　ensures　the　prevention　of　local　buckling　in　both　the　external　steel　plates　and　the　entire　composite　plate,　thereby　enhancing　structural　stability.　©　2024