This　paper　presents　herein　pertains　the　experimental　and　numerical　investigations　on　axial　compressive　behavior　of　square　concrete-filled　stainless　steel　tube　(CFSST)　columns　after　high-temperature　sliding.　A　total　of　117　CFSST　specimens　were　tested　under　axial　compression　loading.　The　design　variables　included　tube　thickness,　temperature,　duration,　and　concrete　compressive　strength.　Test　results　indicated　that　the　initial　stiffness　of　square　CFSST　short　columns　was　degenerated　due　to　high-temperature　sliding.　CFSST　specimens　exhibited　a　62.7%　lowest　residual　strength　at　1000　°C.　The　influence　of　high-temperature　duration　on　the　residual　strength　of　square　CFSST　short　columns　after　high-temperature　sliding　was　limited.　The　residual　strength　of　specimens　was　positively　correlated　with　the　thickness　and　concrete　strength.　All　square　CFSST　columns　after　high-temperature　sliding　experienced　an　outward　local　buckling　under　axial　compression.　Finite　element　models　of　square　CFSST　columns　after　high-temperature　sliding　are　established　and　validated　against　the　experimental　results.　In　addition,　the　parameter　formulae　of　residual　strength　for　CFSST　columns　after　high-temperature　sliding　were　proposed,　which　achieved　high　accuracy.　This　research　results　could　provide　strengthening　reference　for　the　application　of　CFSST　columns　after　high-temperature　sliding.　©　2023