A　two　stage　up-flow　sludge　blanket　(UASB)　and　sequencing　batch　reactor　(SBR)　system　was　used　to　treat　municipal　landfill　leachate　and　took　high　efficiency　in　the　removal　of　nitrogen.　Raw　leachate　was　diluted　with　tap　water　in　different　proportions　and　the　influent　was　increased　by　four　phases,　high-efficiency　treatment　was　achieved　when　start-up　was　finished.　In　the　study,　the　UASB1　has　two　significant　effects:　firstly,　denitrification　reaction　of　high　efficiency　was　conduct　for　SBR　nitrified　effluent　recirculated　by　using　the　abundant　organic　matters　in　the　raw　leachate　as　carbon　source,　secondly,　it　removal　COD　highly　effectively　by　anaerobic　biodegradation.　When　COD　concentration　was　from　3.5　g/L　to　12　g/L,　COD　rem　1.20　g/L,　the　effluent　NH4+-N　removal　efficiency　was　maintained　around　99%.　Besides,　total　nitrogen　(TN)　removal　efficiency　could　reach　85%　with　the　effluent　TN　lower　than　15　mg/L.