This　paper　presented　experimental　study　on　the　long-term　deformation　and　load　carrying　capacities　of　concrete-filled　steel　tubular　(CFST)　stub　columns　with　initial　concrete　imperfection.　The　main　parameters　were　the　gap　type,　gap　ratio　and　long-term　sustained　load　level.　The　experimental　results　show　that,　under　the　long-term　sustained　load,　the　upper　limit　of　ultimate　creep　coefficients　of　CFST　stub　columns　with　initial　concrete　imperfection　is　0.9,　which　is　similar　to　normal　CFST　stub　columns.　The　ultimate　capacity　of　the　CFST　stub　column　with　initial　concrete　imperfection　increases　moderately　with　the　increase　of　long-term　sustained　load　level.　A　finite　element　(FE)　model　was　developed　using　the　software　ABAQUS　to　analyse　the　long-term　behavior　of　CFST　columns　with　initial　concrete　imperfection.　The　FEA　results　generally　agree　well　with　test　results.　Based　on　the　verified　FE　model,　the　influences　of　the　slenderness　ratio,　steel　ratio,　yield　strength　of　steel　tube,　concrete　strength,　long-term　sustained　load　level,　gap　ratio　and　load　eccentricity　ratio　on　the　load　carrying　capacity　of　CFST　columns　with　initial　concrete　imperfection　were　investigated.　According　to　the　parametric　analysis,　the　effect　of　initial　concrete　imperfection　on　the　ultimate　capacity　of　CFST　columns　subjected　to　long-term　sustained　loading　is　less　than　1.5%.　Meanwhile,　an　existing　design　method　for　normal　CFST　columns　considering　the　effect　of　the　long-term　sustained　load　can　be　used　to　predict　the　load　carrying　capacity　of　CFST　columns　with　initial　concrete　imperfection.　©　2020,　Editorial　Office　of　Journal　of　Building　Structures.　All　right　reserved.