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A biological anoxic-aerobic reactor filled with porous media was operated in lab scale for the advancedwastewater treatment. The experiments were conducted for 6 months with three HRTs (4, 6, 8hr) andtemperature of 23~25C. Some other experimental conditions were as follows; nitrification reactor (MLSS4,500mg/L, DO 3.3mg/L, 23~28C), denitrification reactor(MLSS 8,000mg/L, ORP -100mV, Temp.19~23C). Average removal efficiencies of SS, BOD5, CODCr, T-N, and T-P were 97.8%, 95.5%, 94.5%,80.2%, and 60.6%, respectively. The reactor filled with porosity media showed stable removal capacity fororganics and nutrients. Fast and complete nitrification and denitrification were accomplished. Maintaininghigh MLSS with porous media in the nitrification and denitrification reactor appears to enhance the nitrogenremoval process. For the higher T-P removal, some coagulant addition process will be needed.