Due　to　the　difficulty　of　nitrogen　removal　in　the　mature　landfill　leachate,　a　combined　process　consisting　of　short-term　nitrification　sequencing　batch　reactor　(SNSBR)　and　anaerobic　ammonium　oxidation　sequencing　batch　reactor　(ASBR)　was　developed　to　treat　the　advanced　stage　landfill　leachate.　After　the　domestication　and　cultivation　of　50　d,　the　concentration　of　NO2--N　in　the　SNSBR　effluent　is　maintained　at　about　500　mg/L,　and　the　short-term　nitrification　rate　can　be　maintained　at　above　98%.　In　order　to　eliminate　the　inhibition　of　the　high　concentration　of　NO2--N　put　on　the　anammox　bacteria,　the　operation　of　ASBR　was　changed　from　the　traditional　type　to　the　one　of　continuous　influent　during　the　reaction　period　and　interval　settle　and　effluent　with　the　HRT　being　about　20　h.　The　experiment　consisted　of　two　stages,　namely,　the　start-up　and　the　domestication.　During　the　start-up,　as　the　concentration　of　NO2--N　was　increased　from　60　mg/L　to　395　mg/L,　the　ammonium　and　nitrite　removal　efficiency　both　reached　over　98%,　and　total　nitrogen　volume　removal　rate　was　increased　from　0.10　kg/(m3·d)　to　0.75　kg/(m3·d).　After　domestication,　mix　the　leachate　into　the　influent　by　increasing　the　rate　of　20%　every　phase.　On　the　day　of　156,　all　of　the　NO2--N　in　the　influent　came　from　the　effluent　of　the　SNSBR.　The　results　show　that　nonbiodegradable　COD　of　the　leachate　cannot　inhibit　the　anammox　bacteria,　however,　a　little　denitrification　increases　the　total　nitrogen　removal　efficiency　of　the　system.　The　total　nitrogen　volume　removal　rate　is　0.76　kg/(m3·d),　and　the　concentration　of　COD,　nitrite　and　ammonium　in　the　influent　and　effluent　is　295,　390,　295　and　246,　1.3,　0.6　mg/L,　respectively.　The　nitrogen　removal　efficiency　of　the　system　can　reach　above　90%　without　any　carbon　source　addition,　which　shows　good　performance　of　nitrogen　removal　efficiency.