To　solve　the　problem　of　insufficient　interface　bond　strength　of　concrete-filled　square　steel　tubes　(CFSSTs),　16　large　CFSST　specimens　with　eight　different　types　of　connectors　(no　additional　connectors,　built-in　studs,　built-in　circular　ribs,　built-in　vertical　ribs,　built-in　reinforcement　cage,　and　various　combinations　of　the　above)　were　designed　for　push-out　testing.　Specimens　were　constructed　using　high-strength　concrete　or　high-strength　recycled　aggregate　concrete　(RAC).　The　bond　behavior　and　slip　failure　mechanism　were　analyzed　by　comparing　the　force-slip　curves,　slip　displacements,　and　steel　tube　strains.　The　bond　strength　calculation　method　and　bondslip　constitutive　relationship　of　the　interface　under　multiple　parameters　were　obtained.　Experiments　revealed　the　following:　bond-slip　curves　for　CFSST　without　additional　connectors　were　composed　of　an　ascending　section　and　a　residual　section;　for　tubes　with　different　connectors,　the　peak　values　of　the　curves　were　higher;　the　performance-price　ratio　of　studs　and　circular　ribs　for　improving　bond　strength　was　high,　and　the　combined　use　of　studs　and　circular　ribs　can　work　well;　the　combination　of　circular　ribs　and　vertical　ribs　can　significantly　improve　bond　strength　and　energy　dissipation　capacity;　RAC　had　better　bond　behavior　than　normal　concrete　in　HSCFSST　without　additional　connectors　or　built-in　vertical　ribs.　The　predicted　force-slip　curves　agreed　well　with　the　test　curves,　providing　a　theoretical　basis　for　CFSST　applications.