Arch　is　an　ideal　structure　for　concrete　with　high　compression　strength　and　limited　tensile　strength.　It　may　be　favorable　to　use　ultra-high　strength　concrete,　such　as　Reactive　Powder　Concrete　(RPC),　to　reduce　the　structural　dead-weight　and　facilitate　the　construction.　In　order　to　build　an　RPC　arch　bridge　in　China,　trial　design,　model　tests,　as　well　as　research　on　RPC　material　have　been　carried　out.　In　the　trial　design,　the　Wanxian　Yangtze　River　Bridge　with　a　main　span　of　420m　is　taken　as　prototype.　Analysis　results　show　that　by　utilizing　RPC　much　thinner　cross　section　elements　can　be　adopted　due　to　its　high　performance　and　strength,　hence　effectively　reducing　the　self-weight　of　the　arch　ring　and　consequently　the　internal　forces　caused　by　the　self-weight　and　also　furthering　a　notably　easier　construction.　In　the　experimental　research,　the　behavior　of　two　RPC　arch　models　were　tested　with　concentrated　loads　at　quarter-span.　Load-displacement　curves,　strains,　cracks,　failure　modes　and　ultimate　load-carrying　capacity　of　the　arches　were　analyzed　and　compared　with　results　obtained　on　reinforced　concrete　(RC)　arch　models.　Experimental　results　show　that　the　behavior　of　RPC　arches　is　similar　to　that　of　RC　arches.　The　RPC　arches　also　fail　due　to　the　mechanism　formed　by　four　plastic　hinges　caused　by　cracks　in　tensile　areas.　But　the　initial　crack　load,　reinforcement　yielding　load　and　ultimate　carrying　capacity　of　RPC　arches　are　2　to　3　times　larger　than　those　of　RC　arches;　and　the　largest　crack　width　in　RPC　arches　is　only　forty　percent　of　that　of　RC　arches.　In　conclusion,　results　of　our　preliminary　research　seem　to　indicate　that　it　is　possible　to　use　Reactive　Powder　Concrete　(RPC)　in　long　span　arch　bridges.