Experimental　study　on　mechanical　properties　of　circular　CFST　stub　columns　after　freeze-thaw　cycles,　the　parameters　of　the　test　were　the　thickness　of　circular　steel　tubular,　the　number　of　freeze-thaw　cycles　and　the　strength　of　concrete.　The　axial　compression　failure　phenomenon,　load-displacement　curve　and　stress-strain　curve　of　the　circular　CFST　stub　column　after　freeze-thaw　cycles　were　analyzed.　The　experimental　results　show　that　the　failure　mode　of　the　circular　CFST　short　column　under　axial　compression　after　freeze-thaw　cycles　is　similar　to　that　without　freeze-thaw　cycle;　the　axial　bearing　capacity　of　circular　CFST　stub　columns　after　freeze-thaw　cycles　is　improved　with　the　decreasing　ratio　of　radial　diameter　to　thickness　of　specimens;　the　initial　stiffness　of　the　circular　CFST　stub　columns　increases　with　the　increasing　concrete　strength　grade;　the　freeze-thaw　cycles　have　a　little　effects　on　the　axial　bearing　capacity　of　circular　CFST　stub　columns;　the　circular　CFST　short　columns　have　better　application　in　freezing　and　thawing　environment.　According　to　the　test　results,　the　formula　for　caculating　the　axial　bearing　capacity　of　circular　CFST　stub　column　after　freeze-thaw　cycles　was　proposed,　which　was　in　good　agreement　with　the　experimental　results.　©　2019,　Editorial　Office　of　Journal　of　Building　Structures.　All　right　reserved.