The　double　steel　plate　concrete　composite　shear　wall　(DSCW)　structure　combines　the　advantages　of　steel　and　concrete,　offering　high　strength,　stiffness,　and　durability.　The　joint　formed　by　the　DSCW　and　reinforced　concrete　foundation　(RC　foundation)　was　often　unavoidable　in　engineering　practice.　Research　related　to　the　mechanical　behavior　of　the　DSCW-RC　foundation　is　limited.　This　paper　investigated　the　shear　performance　of　DSCW-RC　joints　with　lap-spliced　steel　bars.　A　total　of　seven　specimens　were　designed　and　tested.　The　influences　of　steel　plate　thickness,　steel　bar　arrangement,　and　stud　spacing　on　the　shear　behavior　of　the　joints　are　elucidated.　The　test　results　indicate　that　the　predominant　failure　mode　of　the　specimens　occurred　in　the　upper　part　of　the　local　steel　plate,　with　reinforcement　yielding.　While　steel　bar　diameter　and　stud　spacing　minimally　affected　the　shear　strength,　they　significantly　influenced　the　failure　displacement　at　the　joint　interface.　The　failure　deformation　increased　with　increasing　steel　bar　diameter　and　decreased　with　increasing　stud　spacing.　Moreover,　the　thickness　of　the　steel　plate　profoundly　impacted　structural　shear　strength　and　deformation,　with　both　deformation　and　bearing　capacity　increasing　with　plate　thickness.　In　addition,　this　study　explores　the　force-transferring　mechanism　of　such　joints　under　shear　load,　offering　a　crucial　reference　for　subsequent　analyses　of　the　composite　force　mechanism　of　DSCW　-　RC　foundation　joints.　©　2024　Institution　of　Structural　Engineers