Swimming　bed　combined　with　aerobic　granular　sludge　as　a　novel　technology　for　wastewater　treatment　was　developed,　which　was　on　the　basis　of　the　biofilm　process　and　activated　sludge　process,　and　results　demonstrated　notable　performance　of　high-efficiency　treatment　capability　and　sludge　reduction.　Even　when　hydraulic　retention　time　(HRT)　was　only　at　3.2　h　with　average　COD　volumetric　loading　of　2.03　kg/(m3　·d)　and　NH4+-N　of　0.52　kg/(m3·　d),　90.9%　of　average　COD　removal　rate　and　98.3%　of　NH4+-N　removal　rate　were　achieved.　Aerobic　granular　sludge　appeared　with　spherical　or　rod　shape　after　16　days　operation.　Mixed　liquor　suspended　solid　(MLSS)　concentrations　in　the　reactor　reached　5640　mg/L　at　the　highest　during　operation　period,　and　the　average　ratio　of　mixed　liquor　volatile　suspended　solid　(MLVSS)　to　MLSS　reached　0.87.　Furthermore,　microscopic　observation　of　biofilm　and　aerobic　granules　revealed　much　presence　of　protozoa　and　metazoa　on　the　biofilm　and　suspended　sludge,　and　this　long　food　chain　can　contribute　to　the　sludge　reduction.　Only　0.1755　of　sludge　yields　(MLSS/CODremoved)　was　obtained　in　the　experiment,　which　was　only　about　50%　of　the　conventional　aerobic　processes.