Taking　Wanxian　Yangtze　River　Bridge　with　a　main　span　of　420m　as　prototype,　trial　design　of　Reactive　Powder　Concrete　(RPC)　arch　bridge　was　carried　out.　Analysis　results　show　that　much　thinner　cross　section　can　be　adopted　due　to　its　high　performance　and　strength,　the　self-weight　of　the　arch　ring　can　be　reduced　effectively,　subsequently　the　internal　forces　caused　by　the　self-weight　and　the　difficulty　in　construction　decrease　notability.　Preliminary　research　indicates　that　it　is　possible　to　use　Reactive　Powder　Concrete　(RPC)　in　long　span　arch　bridge.