The　nitrogen　removal　performance　of　an　ANAMMOX-UASB-biofilm　system　was　comparatively　investigated　in　two　up-flow　anaerobic　sludge　blanket　(UASB)　reactors,　one　of　which　was　fed　with　mature　landfill　leachate　polluted　water,　and　the　other　one　fed　with　inorganic　polluted　water.　ANAMMOX,　nitrification,　denitrification　activity　and　physical-chemical　characteristics　of　the　ANAMMOX　granular　sludge　were　studied　and　contrasted.　The　results　showed　that　a　high　nitrogen　removal　efficiency　was　achieved　through　coupling　ANAMMOX　and　denitrification　in　the　1#　system　after　continuous　cultivation.　In　the　stable　stage,　86.66%　and　76.77%　of　the　total　nitrogen　on　average　were　removed　in　the　1#　and　2#　systems　respectively.　ANAMMOX,　nitrification　and　denitrification　activity　were　observed　in　both　the　1#　and　2#　systems.　The　ANAMMOX　and　nitrification　activity　in　the　1#　system　was　lower　than　that　in　the　2#　system,　whereas　the　denitrification　activity　in　the　1#　system　was　higher　than　that　in　the　2#　system;　the　TN　removal　rates　of　ANAMMOX　in　the　systems　were　0.286　and　0.301　g/(g·d)　respectively.　The　color　of　the　granular　sludge　in　the　1#　system　changed　from　brick　red　to　red-brown,　and　the　color　of　the　granular　sludge　in　the　2#　system　was　brick　red　continuously.　The　size　of　the　granular　sludges　in　the　1#　and　2#　systems　were　mainly　between　1.5　and　2.5　mm,　and　the　weight　proportions　were　66.10%　and　50.67%　respectively,　which　were　in　the　best　mass　transfer　range.　©　2016,　Editorial　Board,　Research　of　Environmental　Sciences.　All　right　reserved.