This　paper　investigated　local　compressive　behavior　of　square　concrete-filled　double　tubular　(CFDT)　specimens.　A　total　of　twenty-nine　specimens　were　tested　under　axial　local　compression　to　study　the　influence　of　the　inner　tube,　bearing　block　shape,　local　compression　area　ratio,　outer　steel　tube　thickness,　concrete　strength,　and　steel　strength　on　the　local　compressive　bearing　capacity　of　specimens.　The　working　mechanism　of　CFDT　under　local　compression　was　analyzed.　The　results　show　CFDT　specimens　exhibit　superior　bearing　capacity　and　ductility,　compared　to　conventional　CFST　specimens.　The　larger　confinement　effect　coefficient　&　xi;　or　local　compression　area　ratio　&　beta;　can　delay　the　appearance　of　the　descending　stage　of　N　-　&　UDelta;　curve　and　improve　the　ductility　of　the　specimen.　The　increasing　degree　of　bearing　capacity　is　related　to　&　beta;.　When　&　beta;　=　2.25,　the　most　effective　measure　is　to　increase　the　thickness　of　the　outer　tube,　up　to　36.8　%.　When　&　beta;　=　9,　the　use　of　high-strength　concrete　is　more　conducive　to　improving　the　bearing　capacity,　up　to　21.8　%.　The　shape　of　bearing　block　has　little　effect　on　the　bearing　capacity.　In　addition,　finite　element　model　was　established　and　analyzed　based　on　experimental　results,　reasonably　agreement　was　obtained　between　numerical　and　measured　results.　An　evaluation　method　for　calculating　the　local　bearing　capacity　were　proposed,　which　showed　good　consistency　with　experimental　results.