The　experiment　explored　the　effect　of　different　seeding　sludge　on　the　rapid　start-up　of　an　anaerobic　ammonium　oxidation　(ANAMMOX)　reactor　by　seeding　a　single　type　of　denitrified　granular　sludge　and　a　mixed　sludge　composed　of　denitrified　granular　sludge　and　aerobic　nitrification　sludge　(the　volume　ratio　of　the　mixed　sludge　was　2:1)　in　two　sequencing　batch　reactors　(SBR),　R0　and　R1,　respectively.　The　results　indicated　that　R0　was　started　up　successfully　on　day　64　with　a　nitrogen　removal　rate　(NRR)　of　0.26　kg·(m3·d)-1,　while　R1　was　started　up　by　day　47　with　a　NRR　of　0.30　kg·(m3·d)-1,　which　was　shorter　than　R0　by　17　d.　In　the　enrichment　stage,　reddish　sludge　appeared　in　R1,　and　the　characteristics　of　anaerobic　ammonium　oxidation　of　the　system　were　more　obvious　than　in　R0.　After　the　reactor　was　started　up　successfully,　the　stoichiometric　ratio　of　R0　was　1.20　and　0.34,　respectively,　and　the　stoichiometric　ratio　of　R1　was　1.26　and　0.21,　which　was　closer　to　the　theoretical　values　of　1.32　and　0.26.　The　mixed　liquor　suspended　solids　(MLSS)　and　mixed　liquor　volatile　suspended　solids　(MLVSS)　of　R0　were　restored　to　51%　(4.2　g·L-1)　and　38%　(2.3　g·L-1)of　the　initial　seeding　sludge,　respectively,　while　the　MLSS　and　MLVSS　of　R1　were　restored　to　54%　(4.4　g·L-1)　and　42%　(2.6　g·L-1),　which　was　higher　than　R0.　It　can　be　speculated　that　the　proliferation　rate　of　AnAOB　in　R1　was　faster　than　in　R0.　Seeding　mixed　sludge　can　accelerate　the　start-up　process　of　anaerobic　ammonium　oxidation　with　more　stable　N-removal　performance.　©　2017,　Science　Press.　All　right　reserved.