The　tests　of　ultimate　bearing　capacity　for　19　plain　concrete　columns　were　carried　out.　The　reasonable　scopes　of　slenderness　and　eccentricity　of　plain　concrete　columns　were　proposed.　The　bearing　capacities　of　test　columns　were　calculated　by　nonlinear　finite　element　method.　A　calculation　method　of　ultimate　bearing　capacity　for　plain　concrete　column　was　presented　by　theoretical　analysis　and　regression　of　test　data.　Calculation　result　shows　that　when　the　slendernesses　of　test　columns　are　higher　than　15　and　the　eccentricities　are　0.3,　their　failure　modes　are　section　tensile　failure,　which　can　not　play　full　material　performance　of　compression.　When　the　slendernesses　are　not　higher　than　15　and　the　eccentricities　are　not　higher　than　0.3,　their　failure　modes　are　section　compression　failure.　The　mean　ratio　of　calculated　values　by　the　finite　element　method　to　test　values　is　0.995,　the　variance　is　0.001　8,　so　the　calculated　value　fits　well　with　test　value,　and　the　finite　element　method　can　be　used　for　the　parameter　analysis　of　plain　concrete　column.　Based　on　considering　the　coupling　influence　of　slenderness　and　eccentricity　on　bearing　capacity,　in　the　proposed　calculation　method　of　ultimate　bearing　capacity,　the　mean　ratio　of　calculated　values　by　the　proposed　method　and　the　finite　element　method　is　0.976,　the　variance　is　0.003,　which　indicates　that　the　proposed　method　has　high　precision　and　high　safety.　2　tabs,　17　figs,　20　refs.　©,　2015,　Chang＇an　University.　All　right　reserved.