In　practice,　fiber-reinforced　polymer　(FRP)　materials　have　been　widely　used　to　reinforce　structures.　A　new　type　of　composite　member,　i.e.,　high-strength　steel-concrete-FRP-concrete　(SCFC)　composite　columns,　was　proposed　by　taking　advantage　of　high-strength　steel　and　FRP.　Hence,　this　paper　conducted　an　experimental　and　numerical　study　on　its　eccentric　compressive　behavior.　A　total　of　11　tests　were　designed,　with　main　testing　parameters　including　the　thickness　of　GFRP　tube　(tf),　thickness　of　steel　tube　(ts),　eccentricity　(e),　yield　strength　of　steel　(fy),　and　compressive　strength　of　concrete　(fc′).　Results　indicated　that:　(i)　the　high-strength　SCFC　member　had　obvious　post-yield　strengthening　behavior,　owing　to　the　confining　effect　from　the　FRP　tube,　and　(ii)　the　member　reached　peak　load　when　the　GFRP　tube　fractured.　A　finite　element　(FE)　model　was　established　and　benchmarked,　and　parametric　analyses　were　conducted　based　on　the　benchmarked　FE　model.　It　was　found　that:　(i)　increasing　fy,　tf　or　FRP　tube　diameter-to-width　ratio　(Df/B)　improved　the　strength　but　had　no　significant　effect　on　the　initial　stiffness;　(ii)　increasing　ts　and　fc′　increased　both　the　strength　and　the　initial　stiffness;　(iii)　increasing　e　reduced　the　strength　and　the　initial　stiffness;　and　(iv)　the　eccentric　compression　behavior　of　the　member　was　similar　to　that　of　square　concrete-filled　steel　tube　(CFST)　when　e　was　high.　Finally,　equations　for　estimating　the　strength　of　high-strength　square　SCFC　columns　under　eccentric　compression　were　proposed.　©　2024　Elsevier　Ltd