This　paper　proposed　a　hybrid　column　by　embedding　glass　fiber-reinforced　polymer　(GFRP)　tube　into　high-strength　square　concrete-filled　steel　tube　(CFT),　named　as　high-strength　square　steel-concrete-GFRP　concrete　(SCFC)　column.　A　total　of　13　high-strength　square　SCFC　short　columns　were　tested.　The　test　parameters　included　diameter　and　thickness　of　GFRP　tube,　width　and　thickness　of　steel　tube,　yield　stress　of　steel,　and　compressive　strength　of　concrete.　Results　showed　that　high-strength　square　SCFC　short　columns　exhibited　post-yield　strengthening　behavior　and　stable　residual　strength.　The　axial　strength,　confining　effect,　and　ductility　were　improved　because　of　the　embedded　GFRP　tube.　Detailed　finite　element　models　were　developed　and　benchmarked　to　investigate　the　strength　contribution　of　each　component　and　conduct　parametric　studies.　It　was　shown　that:　(i)　the　concrete　infill　and　the　steel　tube　contributed　＞90%　to　the　overall　compressive　strength　and　(ii)　the　strength　improvement　by　embedding　GFRP　tube　was　closely　related　to　the　section　size　ratio,　confinement　ratio　of　the　GFRP　tube,　and　confinement　ratio　of　the　steel　tube.　Evaluation　of　the　current　equations　showed　that　they　were　not　accurate　enough　to　estimate　the　axial　compressive　strength　of　high-strength　square　SCFC　short　columns.　New　equations　were　then　proposed.　©　2023