A　two-stage　upflow　anaerobic　sludge　blanket　(UASB)　and　sequencing　batch　reactor　(SBR)　system　was　introduced　to　treat　landfill　leachate　for　advanced　removal　of　COD　and　nitrogen　at　low　temperature.　In　order　to　improve　the　total　nitrogen　(TN)　removal　efficiency　and　to　reduce　the　COD　requirement　for　denitrification,　the　raw　leachate　with　recycled　SBR　nitrification　supernatant　was　pumped　into　the　first-stage　UASB　(UASB1)　to　achieve　simultaneous　denitrification　and　methanogenesis.　The　results　showed　that　UASB1　played　an　important　role　in　COD　removal　and　UASB2　and　SBR　further　enhanced　the　nutrient　removal　efficiency.　When　the　organic　loading　rates　of　UASB1,　UASB2　and　SBR　were　11.95,　1.63　and　1.29　kg　COD/(m(3).day),　respectively,　the　total　COD　removal　efficiency　of　the　whole　system　reached　96.7%.　The　SBR　acted　as　the　real　undertaker　for　Na-4(+)-N　removal　due　to　aerobic　nitrification.　The　system　obtained　about　99.7%　of　NH4+-N　removal　efficiency　at　relatively　low　temperature　(14.9-10.9　degrees　C).　More　than　98.3%　TN　was　removed　through　complete　denitrification　in　UASB　I　and　SBR.　In　addition,　temperature　had　a　significant　effect　on　the　rates　of　nitrification　and　denitrification　rather　than　the　removal　of　TN　and　Na-4(+)-N　once　the　complete　nitrification　and　denitrification　were　achieved.