This　paper　reports　an　experimental　study　on　the　mechanical　performance　of　concrete　encased　steel　(CES)　stub　columns　after　exposure　to　high　temperatures.　A　total　of　81　CES　stub　columns　are　tested,　including　77　specimens　that　are　heated　for　different　durations　and　4　that　are　unheated.　Each　test　examines　the　influences　of　volumestirrup　ratio,　heating　duration,　fire　resistant　coating　thickness　and　cooling　method　(air-cooled　and　waterquenched)　on　the　strength,　deformation,　elastic　modulus　and　ductility　characteristics　of　specimens.　Findings　show　that　heating　duration　and　fire-resistant　coating　thickness　have　the　greatest　effects　on　the　mechanical　response　of　CES　stub　columns.　The　effects　of　volume-stirrup　ratio　and　cooling　method　decrease　in　turn.　The　residual　strengths　of　post-fire　CES　stub　columns　are　positively　related　to　volume-stirrup　ratio　and　fire-resistant　coating　thickness　and　negatively　correlated　with　heating　duration.　Without　fire　protection　layer,　CES　stub　columns　on　average　retained　0.89,　0.76,　0.58　and　0.5　times　of　the　original　strength　after　exposure　to　high　temperature　with　heating　durations　of　0.5　h,　1　h,　1.5　h　and　2　h.　After　being　protected　by　fire-resistance　coating　of　16　mm　thick,　the　strengths　on　average　only　decrease　by　5.45%,　5.96%,　13.81%　and　20.38%,　respectively.　Water　cooling　on　average　decreases　the　resistance　to　compression　by　5.6%　compared　with　natural　cooling.　Finally,　formulae　are　suggested　for　predicting　the　ultimate　strength　of　CES　stub　columns　after　exposure　to　high　temperature.　It　is　verified　that　the　calculated　values　from　the　formulae　are　in　good　agreement　with　the　experimental　results.