In　order　to　achieve　advanced　nitrogen　removal　while　removing　organics　in　the　landfill　leachate,　SBR　(sequencing　batch　reactor)　was　applied　with　the　operation　in　which　the　stir　and　aeration　were　alternately　proceeded　until　the　completion　of　nitrification　and　then　anoxic　stir　was　well　proceeded　until　the　completion　of　endogenous　denitrification　without　any　external　carbon　source　added.　Under　the　synergistic　effect　of　alternate　stir　and　aeration,　SND　(simultaneous　nitrification　and　denitrification)　and　endogenous　denitrification,　the　effluent　TN(total　nitrogen)　can　be　less　than　40　mg/L　and　TN　removal　reaches　over　95%　without　any　external　carbon　source　added,　which　meets　the　Chinese　latest　TN　discharge　standards　of　leachate.　Meanwhile,　since　50%　TN　is　removed　through　endogenous　denitrification,　the　mixed　liquor　suspended　solids　maintains　at　about　6　g/L　and　the　yield　of　sludge　reduces　greatly.　The　contrast　tests　under　different　operation　modes　indicate　that　the　content　of　polyhydroxyalkanoates　in　the　activated　sludge　is　the　key　factor　of　the　nitrogen　removal　efficiency　of　the　system.　The　previous　anaerobic　time　before　nitrification　and　the　short　interval　time　during　the　nitrification　are　good　to　increase　the　carbon　storage　of　the　sludge　and　improve　the　nitrogen　removal　efficiency.　Conventional　continuous　aeration　without　stirring　can　not　achieve　advanced　nitrogen　removal　via　endogenous　denitrification.