By　the　application　of　the　calculation　methods　of　masonry　columns　and　plain　concrete　columns　in　Codes　for　Design　of　Highway　Masonry　Bridges　and　Culverts　(JTG　D61-2005)　and　the　calculation　methods　of　reinforced　concrete　columns　in　Code　for　Design　of　Highway　Reinforced　Concrete　and　Prestressed　Concrete　Bridges　and　Culverts　(JTG　D62-2004),　the　load-carrying　capacities　of　3　reinforced　concrete　arch　bridges　with　the　spans　of　70,　160,　420　m　were　calculated　respectively.　The　change　rules　of　the　bearing　capacities　of　reinforced　concrete　columns　were　studied　considering　slenderness　ratio,　eccentricity,　reinforcement　ratio,　and　etc.　The　parameter　ranges　of　the　equivalent　beam-column　of　concrete　arches　and　the　ultimate　bearing　capacities　of　masonry　columns,　plain　concrete　columns　and　reinforced　concrete　columns　were　analyzed.　Analysis　result　shows　that　the　bearing　capacities　calculated　by　JTG　D61-2005　are　greater　than　those　calculated　by　JTG　D62-2004　when　reinforced　concrete　arches　with　low　reinforcement　ratio　are　treated　as　equivalent　beam-column.　For　reinforced　concrete　columns　with　low　reinforcement　ratios　and　high　slenderness　ratios　and　eccentricities,　the　bearing　capacities　calculated　by　the　formulas　of　reinforced　concrete　columns　are　smaller　than　those　calculated　by　the　formulas　of　masonry　columns　or　plain　concrete　columns.　Thus　it　can　be　seen　that　there　are　unreasonable　factors　in　the　calculation　methods　of　eccentrically　loaded　concrete　columns　in　two　codes,　which　should　be　improved.　3　tabs,　7　figs,　25　refs.