Abstract: Aimed at the conditions of treating ammonia in phosphate tail gas at present，rotating packed bed was used as a replacement of the conventional towers with acid waste water as absorbent. Pilot scale experiment was made to determine the capacity of ammonia removal from phosphate tail gas. The result showed that the absorptivity of ammonia could reach 90% when gas flow was 500m³·h^－1，gas-liquid ratio was 1000 m³·m^－3，high gravity factor was 90. Stable operation of the equipment was maintained and the content of ammonia in phosphate tail gas reached the state discharge standards after treatment.