Nitrobacteria, nitrosobacteria and antinitrobacteria which were successfully used in wastewater treating project had been separated and artificially cultured in our laboratory, the predominantbacteria were immunoadsorpted on ceramic filler and made into a minitype equipment of removingammonia. When air with ammonia (NH3) passed through the equipment, the ammonia, were beremoved the results indicated that: the concentration of NH3 was 28~111 mg/m3 when the in fluent volume was separately 0. 12 m3/h, 0. 183m/h, and the concentration in effluent decreased to0. 06~0. 32mg/m3, the efficiency of deodorizing was 99. 19 %~99. 89%, in the equipment PHremained 7. 0. It was certified this system had a high and stable efficiency.