To　recover　nitrogen　and　phosphorus　from　the　supernatant　of　anaerobic　fermentation　of　excess　sludge　in　the　form　of　struvite　(MAP,　MgNH4PO4•6H2O),　the　optimum　conditions　of　nitrogen　and　phosphorus　dissolution　and　the　effects　of　different　reaction　conditions　on　nitrogen　and　phosphorus　recovery　were　studied.　The　results　showed　that　the　concentration　of　ammonia　nitrogen　and　orthophosphate　that　dissolved　in　the　fermentation　liquid　peaked　on　the　fifth　day　of　the　experiment　at　pH　10.5　and　35.　When　a　phosphorus　source　was　and　was　not　added,　the　optimum　conditions　for　recovering　phosphorus　were　pH=9.5,　N:P=0.8,　and　Mg:P=1.8　and　pH=9.5,　Mg:P=1.6,　and　speed=200　r•min-1,　respectively.　In　addition,　reducing　the　N:P　molar　ratio　had　a　significant　effect　on　the　morphology　and　purity　of　the　struvite.　Scanning　electron　microscopy　(SEM),　energy　dispersive　spectrometry　(EDS),　X-ray　diffraction　(XRD),　and　Fourier　transform　infrared　spectroscopy　(FTIR)　were　used　to　analyze　the　surface　appearance　and　phase　composition　of　the　recovered　products.　The　main　component　of　the　precipitate　was　MAP.　Recovery　of　nitrogen　and　phosphorus　in　excess　sludge　in　the　form　of　struvite　is　an　effective　means　for　realizing　sludge　resource　utilization.　©　2019,　Science　Press.　All　right　reserved.