A　Pilot　study　on　advanced　treatment　of　wastewater　produced　by　pressurized　coarse　coal　gasification　was　done　in　a　coal　chemical　plant.　The　feasibility　of　catalytic　ozonation,　UV/O-3,　and　Fenton　process　in　the　advanced　treatment　of　wastewater　produced　by　pressurized　coarse　coal　gasification　process　was　studied　and　catalytic　ozonation　was　proved　to　be　a　good　choice　with　high　COD　removal　(55%).　Furthermore,　a　two-stage　advanced　treatment　process　combined　with　advanced　oxidation　processes　(AOPs)　and　biological　aerated　filter　(BAF)　was　proposed　to　meet　the　requirement　of　ultrafiltration-reverse　osmosis　(UF-RO)　wastewater　reuse　system.　It　was　found　that　catalytic　ozonation　showed　the　advantage　in　the　first　stage　oxidation　while　UV/O-3　process　showed　the　advantage　in　the　second　stage　oxidation.　Ultimately,　we　developed　the　interesting　catalytic　ozonation-BAF-UV/O-3-BAF　process　and　the　effluent　met　the　UF-RO　requirement　of　COD＜50　mg/L,　which　opened　a　new　and　efficient　channel　for　pressurized　coarse　coal　gasification　wastewater　treatment.