An　ozone-biological　aerated　filter　process　was　operated　for　more　than　one　year　to　evaluate　its　feasibility　in　polishing　the　secondary　effluent　of　domestic　wastewater　treatment.　The　average　effluent　COD,　UV254,　color,　turbidity,　NH3-N　were　33.8　mg/L,　0.148　cm-1,　12.6,　1.3　NTU　and　6.4　mg/L　with　the　corresponding　removal　rates　51.9%,　26.6%,　77.2%,　76.4%,　78.0%　respectively.　Main　operational　parameters　were:　ozone　dosage　16　mg/L,　ozone　reaction　time　15　min,　hydraulic　retention　time　of　the　biological　aerated　filter　1　h,　ratio　of　air　to　water　3:1.The　filtration　bed　of　the　biological　aerated　filter　was　filled　with　1　m　high　1-1.2　mm　quartz　sand.　All　results　showed　excellent　performance　of　the　ozone-biological　aerated　filter　process.　Experiences　proved　that　the　operation　parameters　such　as　dosage　of　ozone　should　be　changed　with　the　influent　quality　to　acquire　the　best　quality　of　the　effluent.　©2010　IEEE.