In　order　to　quantitatively　evaluate　the　shear-bearing　capacity　of　shear　connectors　in　square　concrete-filled　steel　tube　(CFST),　ten　push-out　tests　on　square　CFST　with　shear　connectors　were　carried　out,　including　nine　steel　plate　specimens　and　one　steel　bar　specimen　for　comparison.　Test　parameters　were　width　to　thickness　ratio　of　steel　tube,　thickness　of　shear　connectors,　the　number　of　shear　connector　layer　and　their　spacing,　and　types　of　shear　connectors.　The　test　results　demonstrate　that,　with　the　decrease　of　width　to　thickness　ratio　of　steel　tube　and　the　increment　of　thickness　of　shear　connectors,　the　ultimate　bearing　capacity　and　the　elastic　stiffness　were　improved　obviously.　The　ultimate　bearing　capacity　of　CFST　with　double-layer　shear　connectors　was　larger　than　that　with　single-layer　shear　connector.　And　the　spacing　of　steel　plate　influenced　on　the　degree　of　improvement.　In　case　of　the　same　steel　ratio,　the　ultimate　bearing　capacity　of　steel　bar　of　same　layer　was　87%　larger　than　the　steel　plate　and　exhibited　good　ductility.　The　calculated　values　based　on　the　proposed　formula　were　in　good　agreement　with　the　test　values.　©　2018,　Editorial　Board　of　Journal　of　Huazhong　University　of　Science　and　Technology.　All　right　reserved.