A　combined　process　of　a　stage　upflow　anaerobic　sludge　blanket　(UASB1),　an　anoxic/aerobic　(A/O)　reactor　and　a　rear　UASB　(UASB2)　was　used　to　treat　actual　landfill　leachate.　This　process　only　used　the　residual　organic　matter　and　internal　carbon　as　the　carbon　source　to　completely　remove　the　organic　matter,　total　nitrogen　and　ammonia　nitrogen.　The　factors　affecting　the　partial　nitrification　were　also　investigated.　The　influent　leachate　of　the　system　was　mixed　by　raw　leachate　and　domestic　wastewater　in　a　ratio　of　1:5.　The　organic　matter,　total　nitrogen　and　ammonia　nitrogen　of　the　influent　leachate　of　the　system　were　about　1700-1800,　660-700　and　650-680　mg/L,　respectively.　The　experimental　results　showed　that　the　organic　matter,　total　nitrogen　and　ammonia　nitrogen　removal　efficiencies　were　higher　than　95%,　and　the　total　nitrogen　concentration　of　final　effluent　was　about　38　mg/L,　which　was　less　than　the　requirement　of　the　latest　national　emission　standard.　In　addition,　the　combined　inhibition　action　of　the　FA　(free　ammonia)　and　FNA　(free　nitrite　acid)　to　the　NOB　was　the　major　reason　for　the　stable　partial　nitrification　higher　than　80%　of　the　nitrite　accumulation　ratio　in　the　A/O　reactor.　On　the　whole,　the　integrative　process　could　completely　remove　the　nitrite　and　nitrate　produced　by　the　nitrification　in　the　aerobic　zone　of　the　A/O　reactor　and　realize　advanced　nitrogen　removal.　©,　2015,　Editorial　department　of　Molecular　Catalysis.　All　right　reserved.