Combination　of　half-nitrification　process　and　anaerobic　ammonium　oxidation　(ANAMMOX)　process　for　the　treatment　of　rejected　water　with　high　ammonium　and　low　ρ(C)/ρ(N)　are　evaluated.　The　experimental　results　indicated　that　the　nitrition　is　realized　in　29　d　at　9-20　°C,　average　DO　of　5.4　mg/L,　SRT　of　about　30　d　and　influent　ammonia　loading　rate　of　0.64　kg/(m3·d);　The　nitrition　with　75%　nitrite　accumulation　efficiency　maintains　between　30-96　d　when　average　FA　concentration　is　more　than　4　mg/L　in　A/O　reactor;　Furthermore,　the　half-nitrification　is　obtained　because　of　effluent　ammonia　and　nitrite　ratio　of　1:1.32;　Under　the　condition　of　(30±0.2)　°C,　influent　pH　of　7.3　to　7.9,　making　rejected　water　of　nitrition　as　influent,　and　initial　ammonia　and　nitration　load　of　0.07　kg/(m3·d)　and　0.10　kg/(m3·d)　respectively,　simultaneous　removal　of　ammonia　and　nitrite　take　place　in　24　d　in　UASB　reactor　inoculating　with　mixed　sludge　consisted　of　aerobic　granular　sludge,　anaerobic　granular　sludge,　oxidation　ditch　sludge　and　nitrition　sludge,　and　the　total　nitrogen　removal　reaches　up　to　1.03　kg/(m3·d)　was　reached　in　186　d.　After　half-nitrosofication　operated　steadily　and　ANAMMOX　starts　up　successfully,　the　total　nitrogen　removal　reaches　70%　when　they　are　combined　for　105　d.