The purpose of this study is to remove the organics, nitrogen and phosphorus using biosorption for the domestic sewage. The new proccss using biosorption is based on the methods of contact-stabilization, which remove the organics by absorbing them to the surface of the microorganism in the activated sludge. This process consists of biosorption reactor, biosorption clarifier, nitrifying reactor, nitrifying clarifier, deni-trifying reactor, phosphorus uptake(polishing) reactor and final clarifier. The effi-ciency of removal could be reached 91% for organics, 76% for nitrogen, 90% for phos-phorus in Eujungbu pilot plant. We operated the plant which irrigated 10㎥ per day for aewage. During our operation the HRT(Hydraulic Retention time) was main-tained for 10.5hr, but it could be reduced as 8.5hr according to our operation results.