Ultra　high　performance　concrete　(UHPC)　arch　is　a　promising　new　structure　that　is　likely　to　addressing　the　challenge　associated　with　the　inner　force,　self-weight,　durability　and　economy　of　concrete　arch　bridge.　This　paper　focuses　on　estimating　ultimate　load　of　UHPC　fixed　arch　under　different　design　approaches.　Experiments　of　two　catenary　fixed　UHPC　arch　was　briefly　introduced,　and　in　comparison　to　those　of　normal　concrete　(NC)　arches.　Based　on　the　results　of　the　arch　tests,　two　design　approaches　of　concrete　arch　included　equivalent　beam-column　method　and　plastic　ultimate　analysis　method　were　discussed　for　calculating　ultimate　load　of　UHPC　arches.　The　analyses　are　indicated　that　the　plastic　analysis　method　is　more　suitable　for　UHPC　arches　subjected　to　concentrated　load　but　cannot　satisfy　the　request　of　structure　serviceability　and　deformation　within　arch　bridge　design　procedure;　The　equivalent　beam-column　method　is　the　method　for　arch　bridge　in　the　design　code,　but　it　cannot　work　out　reasonable　results　for　UHPC　arch　subjected　to　concentrated　load　for　reasons.　The　calculation　method　for　UHPC　compression　member　with　large　eccentricity　should　be　modified　and　rebuilt　for　further　analysis.