Concrete　core　subjected　to　confinement　effect　from　steel　tube　is　the　main　advantage　of　concretefilled　steel　tubular　(CFST)　column　under　compression.　However,　the　debonding　of　concrete　to　steel　tube　which　is　a　common　phenomenon　in　real　structures　will　have　an　unfavorable　effect　on　the　confinement.　In　this　paper,　the　influence　of　debonding　on　CFST　stub　columns　subjected　to　eccentric　loading　was　investigated　experimentally.　The　debonding　gap　was　formed　by　inserting　galvanized　sheet　in　the　steel　tube　before　the　concrete　fill　and　by　pulling　them　out　after　5~6　hours.　From　the　test,　it　was　verified　that　the　method　to　form　the　debonding　gap　of　specimen　is　valid.　The　parameters　in　the　test　included　the　debonding　arc-length　ratio　and　steel　ratio.　All　the　specimens　failed　in　flexural　mode,　which　indicated　that　the　debonding　has　no　influence　on　the　failure　modes.　The　ultimate　load　capacity　and　the　ductility　of　the　specimens　were　significantly　decreased　with　the　increased　debonding　arc-length　ratio,　while　this　unfavorable　influence　would　decrease　with　the　steel　ratio　increase.