Concrete　filled　steel　tube　(CFST)　built-up　columns　have　been　widely　used　as　building　columns,　bridge　piers　and　arch　ribs　in　civil　engineering.　Much　research　progress　has　been　made　on　them;　however,　attention　was　just　focused　on　CFST　laced　columns,　not　on　CFST　battened　columns.　In　this　paper,　experiments　on　29　CFST　battened　columns　are　carried　out.　The　test　parameters　are　load　eccentricity,　slenderness　ratio,　chord　spacing　and　batten　spacing.　The　whole　loadbearing　process,　the　failure　modes　and　the　ultimate　load-carrying　capacities　of　the　specimens　are　analyzed.　The　studies　show　that　the　eccentricity　and　slenderness　are　the　two　main　parameters　independently　affecting　the　load-carrying　capacities　of　CFST　battened　columns.　Therefore,　the　partial　safety　factor　to　predict　the　reduction　effect　in　DBJ/T　code　for　CFST　laced　column　is　suggested　to　be　used　for　CFST　battened　column.　However,　the　CFST　battened　column　has　lower　resistance　to　shear　than　that　of　the　CFST　laced　column,　the　calculation　method　of　equivalent　slenderness　ratio　for　the　CFST　laced　columns　cannot　be　applied　directly　for　the　CFST　battened　columns.　The　magnifying　factor　K　for　steel　battened　column,　which　is　called　M-K　method,　is　introduced　to　calculate　the　equivalent　slenderness　ratio　for　CFST　laced　columns.