A　two-sludge　denitrifying-phosphorus-removal　system,　integrated　anaerobic/anoxic　/aerobic　process　with　biological　aerated　filter　(AAO-BAF),　was　used　to　treat　domestic　wastewater.　By　analyzing　removal　of　COD　and　nutrients,　the　reactivation　performance　of　AAO-BAF　system　was　evaluated.　The　seed　sludge　with　high　content　of　denitrifying　phosphorus　accumulating　organisms　(DPAOs)　had　been　deposited　under　room　temperature　for　one　month.　Two　start-up　methods　(denoted　as　1#　and　2#)　were　compared,　for　which　the　volume　ratio　of　the　anaerobic/anoxic/aerobic　zone　(Vr)　of　the　AAO　reactor　was　2:5:2　and　2:6:1　respectively.　AAO-BAF　system　exhibited　good　removal　of　COD　and　NH4+-N　without　obvious　deterioration.　At　17th　day,　TN　and　PO43--P　removal　reached　75%　and　92%　respectively　with　two　start-up　methods,　while　the　amount　of　phosphate　taken　up　per　nitrogen　denitrified　increased　from　0.5　to　1.5　mg　PO43--P·(mg　NO3--N)-1.　The　results　demonstrated　that　1#　was　more　suitable　for　the　secondary　start-up　of　AAO-BAF　system,　the　corresponding　COD,　NH4+-N,　TN　and　PO43--P　removal　efficiency　reached　89%,　99%,　70%　and　90%　respectively　at　the　10th　day.　Furthermore,　the　results　also　showed　that　the　sludge　settling ability　was　also　recovered　more　quickly　for　1#　than　2#.　©　All　Rights　Reserved.