The　grouping　technology　of　dissolved　air　flotation　and　aerobic　filters　are　optimal　to　wastewater　advanced　treatment.　Tests　of　improving　secondary　effluent　by　dissolved　air　flotation-aerobic　filter＇s　process　are　studied.　The　results　indicate　that　the　flotation-aerobic　filters　process　can　adapt　well　to　different　influent　concentration,　including　high,　middle　and　low　concentration.　The　average　removal　rates　of　colority,　COD,　ammonia　nitrogen,　total　phosphor　and　turbidity　by　flotation-aerobic　filter＇s　processes　are　64.8%,　47.0%,　80%,　83%,　and　77.8%　respectively.　The　effluent　reaches　the　Water　Quality　Standard　for　Urban　miscellaneous　Water　Consumption　(GB/T　18920-2002)　and　Urban　Wastewater　discharge　standards　(GB/T　18918-2002)　when　the　influent　is　middle　or　low　concentration.　The　UV254　and　bacteria　are　removed　well　too,　and　the　average　removal　rates　are　45.7%　and　62.5%　respectively.　In　the　end,　the　results　show　that　the　flotation　process　plays　a　key　role　in　aspect　of　removing　organics,　turbidity,　total　phosphor　and　UV254,　and　the　aerobic　filters　decrease　the　ammonia　nitrogen　concentration　largely.　On　the　basis　of　the　flotation　process,　much　turbidity　and　organics　can　be　removed.