Characteristics　of　CANON　process　in　a　laboratory-scale　sequencing　batch　biofilm　reactor　were　studied　and　effects　of　temperature　on　nitrogen　removal　performance　were　also　examined.　The　total　nitrogen　removal　rate　of　88.3%　and　the　total　nitrogen　removal　load　of　0.52　kg　N/(m3　·　d)　of　the　reactor　were　achieved,　which　could　prove　that　CANON　process　really　occurred　and　prevailed　in　sequencing　batch　biofilm　reactor.　During　a　batch　operation　period,　changes　of　nitrite　concentration　in　the　reactor　could　be　separated　into　three　phases:　up　phase,　stationary　phase　and　down　phase.　Although　the　break-point　of　DO　curve　appeared　earlier　than　that　of　pH　curve　during　a　reaction　period,　both　of　the　two　break-points　could　indicate　the　termination　of　CANON　reaction.　When　the　liquor　temperature　was　26~35°C,　the　reactor　showed　excellent　nitritation　performance　and　most　of　total　nitrogen　was　disappeared.　When　the　liquor　temperature　was　below　20　°C,　anaerobic　ammonium　oxidation　reaction　was　inhibited　seriously　and　resulted　in　a　large　amount　of　nitrite　accumulation　in　the　reactor.　And　nitritation　reaction　was　inhibited　seriously　when　the　liquor　temperature　was　below　15°C.　The　optimum　temperature　for　anaerobic　ammonium　oxidation　bacteria　growth　was　about　30°C.