In　calculation　of　the　bearing　capacity　of　the　eccentrically　loaded　reinforced　concrete　columns,　in　order　to　consider　the　second　order　effect　of　bending　moment　in　the　section,　the　effect　of　bending　moment　enlargement　coefficient　is　used,　which　includes　two　factors,　i.e.　the　curvature　influence　coefficient　of　eccentricity　ζ1　and　the　curvature　influence　coefficient　of　slenderness　ratio　ζ2.　Some　differences　exist　in　the　calculation　methods　of　these　two　curvature　influence　coefficients　among　the　current　China　design　codes　such　as　the　GB　50010-2010　＇Code　for　design　of　concrete　structure＇　and　JTG　D62-2004　＇Code　for　design　of　highway　reinforced　concrete　and　prestressed　concrete　bridges　and　culverts＇.　Through　the　bearing　capacity　tests　of　14　reinforced　concrete　columns,　the　column　bearing　capacities　obtained　from　test　results　were　compared　with　those　calculated　by　code　methods.　The　results　show　that　the　calculated　bearing　capacity　of　the　specimens　by　the　GB　50010-2010　are　lower　than　the　test　ones　due　to　the　ζ2　is　deleted　in　the　code,　while　the　calculation　method　of　ζ1　in　JTG　D62-2004　is　not　rational　since　the　calculated　bearing　capacities　are　larger　than　the　test　ones　and　tend　to　be　unsafe　for　structures　especially　when　the　eccentricity　is　small.　Based　on　the　experimental　research,　parametric　analyses　by　the　finite　element　method　were　carried　out,　and　the　calculation　formulas　for　ζ1　and　ζ2　were　proposed.　The　accuracy　of　the　proposed　calculation　method　was　verified　by　the　collected　test　results　of　the　references.