The　operation　mode　of　alternating　anaerobic/micro-aerobic　and　A/(O/A)n　was　used　in　SBR　reactor.　The　effects　of　anaerobic/micro-aerobic　and　A/(O/A)n　operating　time　ratio　on　the　short-range　nitrification　denitrifying　phosphorus　removal　were　discussed　by　investigating　the　pollutant　removal,　granular　sludge　characteristics　and　EPS　secretion　during　the　operation.　The　average　removal　efficiency　of　COD　was　always　maintained　above　90%　during　the　whole　operation　period　under　the　operation　mode　of　alternating　anaerobic/micro-aerobic　and　A/(O/A)n.　When　the　operating　time　ratio　of　anaerobic/micro-aerobic　and　A/(O/A)n　was　1:1,　the　nitrogen　and　phosphorus　removal　performance　in　the　system　were　improved,　and　the　average　removal　efficiencies　of　TP　and　TN　reached　95.87%　and　92.00%,　respectively.　The　structure　of　granular　sludge　was　more　compact,　the　EPS　content　reached　92.60mg/gVSS　and　the　PN/PS　was　maintained　at　a　high　level.　However,　the　stability　of　the　granular　sludge　decreased　slightly　when　the　operating　time　ratio　were　1:3　and　3:1.　The　proportion　of　DPAOs　with　nitrite　as　electron　acceptor　and　the　specific　ammonia　oxidation　rate　(N/VSS)　in　the　system　reached　57.76%　and　4.57mg/(g·h)　respectively,　which　indicated　that　when　the　operating　time　ratio　was　1:1,　the　activity　of　functional　bacteria　was　improved　and　it　was　beneficial　to　maintain　good　short-range　nitrification　denitrifying　phosphorus　removal.　©　2022　Chinese　Society　for　Environmental　Sciences.　All　rights　reserved.