Under　the　well-controlled　experimental　conditions,　the　biological　treatability　of　real　municipal　landfill　leachate　with　high　strength　nitrogen　and　high　chemical　oxygen　demand　(COD)　concentration　using　anoxic/anaerobic　upflow　anaerobic　sludge　bed　(UASB)　-sequencing　batch　reactor　(SBR)　combined　process　was　conducted　in　laboratory.　The　results　indicated:　stable　anoxic/anaerobic　UASB-SBR　process　performance　was　developed　during　running　continuously　for　five　phase　(116　d)　when　feed　COD　concentration　was　range　from　1　237.2　mg/L　to　12596.8　mg/L,　effluent　COD　concentration　was　between　108.4　mg/L　and　528.26　mg/L,　and　when　the　influent　ammonia　nitrogen　(NH4(+)　-N)　was　changed　from　155.8　mg/L　to　1298.0　mg/L,　the　effluent　NH4(+)　-N　was　varied　from　0.12　mg/L　to　4.1　mg/L,　it　achieved　high　COD　and　NH4(+)　-N　removal　efficiency.　In　this　present　study,　it　is　noted　that　the　anoxic　UASB1　has　two　significant　effects:　firstly,　denitrification　reaction　of　high　efficiency　was　conducted　for　SBR　nitrified　effluent　recirculated　by　using　the　abundant　organic　matters　in　the　raw　leachate　as　carbon　source.　Secondly,　its　removal　COD　was　highly　effected　by　anaerobic　biodegradation.　The　effluent　COD　of　anoxic　UASB1　was　biodegraded　further　in　the　anaerobic　UASB2　and　aerobic　SBR,　the　maximum　organic　loading　rates　(OLR)　(as　COD)　were　13.0,　2.09,　2.14　kg/(m3　x　d),　respectively.　In　addition,　the　correlation　between　OLR　with　OLRrem　and　COD　removal　efficiency　of　three　reactors　was　studied,　relation　between　nitrogen　loading　rate　(NLR)　with　NH4(+)　-N　removal　efficiency　of　SBR　was　tested　by　linear　regression　analysis,　it　was　found　that　the　OLR　of　anoxic　UASB1,　anaerobic　UASB2　and　aerobic　SBR　increased　linearly　with　OLRrem.　As　to　SBR,　the　correlation　was　significant　between　NLR　(as　N)　with　NLRrem.　In　addition,　the　OLR　of　three　reactors　shows　second　order　exponential　correlation　with　COD　removal　efficiency.　At　last,　when　the　water　temperature　of　SBR　ranged　from　20.7　degrees　C　to　10.3　degrees　C,　and　dissolved　oxygen　was　controlled　below　1.0　mg/L,　the　efficiencies　of　nitrification　and　denitrification　were　above　98.5%　and　97.7%　during　the　whole　experimental　running　period,　it　achieved　advanced　nitrogen　removal.