This　paper　provides　new　test　data　and　changing　regularity　of　behavior　of　rectangular　concrete-filled　steel　tubular　columns　that　have　been　exposed　to　high　temperature　and　subsequently　are　subjected　to　bi-axial　force　and　bending.　Fourteen　specimens　exposed　to　constant　high　temperatures　were　tested　to　investigate　the　residual　behavior　of　them.　The　investigation　emphasized　the　effect　of　experimental　parameters,　such　as　temperature,　slenderness　ratio,　eccentric　angle,　height-to-width　ratio　and　confining　coefficient,　on　residual　bearing　capacity　and　ductility　of　members.　It　is　found　that　the　bearing　capacity　and　ductility　are　mainly　influenced　by　the　testing　parameters.　After　being　heated　to　a　high　temperature　lower　than　600　C,　the　columns　still　have　good　carrying　capacity.　The　ductility　coefficients　of　all　the　specimens　in　the　test　are　not　less　than　5.6,　which　indicates　that　CFST　columns　subjected　to　bi-axial　compression　and　bending　have　good　ductility　even　after　high　temperature　exposure.　The　experimental　results　provide　the　foundation　for　assessing,　repairing　and　strengthening　the　fire-damaged　structures.