In　order　to　construct　a　simultaneous　nitrification　endogenous　denitrification　phosphorus　removal　granular　sludge　system,　four　groups　of　anaerobic/aerobic/anoxic　(AOA)　and　AOA-O　with　different　post-aeration　time　(5min,　10min,　20min)　sequencing　batch　reactors,　were　set　up　in　this　study　to　explore　the　enrichment　of　sludge　granulation　and　denitrifying　phosphate-accumulating　organisms　(DPAOs)　in　different　operation　modes.　The　results　showed　that　the　post-short-term　aeration　reactor　granular　sludge　had　dense　structure　and　good　precipitation　performance,　which　could　enhance　the　storage　of　internal　carbon　source　and　secrete　more　eextracellular　polymeric　substance　(EPS),　and　had　higher　nitrogen　and　phosphorus　removal　rate　and　DPAOs　ratio.　The　biomass　of　R3was　the　highest　and　the　average　particle　size　was　the　largest　(986µm)　when　the　short-term　aeration　time　was　10min.　The　particles　were　mature　and　stable.　Batch　experiment　and　three-dimensional　fluorescence　analysis　showed　that　45.85%　of　the　phosphorus　accumulating　bacteria　were　DPAOs　and　EPS　content　was　the　highest.　During　stable　operation,　the　COD,　TN　and　TP　removal　rates　of　R3　were　94.13%,　89.41%　and　96.11%,　respectively,　and　the　storage　efficiency　of　internal　carbon　source　was　98.09%,　showing　good　treatment　performance.　©　2023　Chinese　Society　for　Environmental　Sciences.　All　rights　reserved.