Abstract: Nitration tail gas mainly of nitrogen oxides was treated in a rotating packed bed. Operation conditions and running stability were studied during the pilot test based on earlier research. The effects of gas flow，liquid gas ratio，high gravity factor and the concentration of absorbent on absorptivity were investigated and the proper conditions were obtained. The results show that the absorptivity of a single stage could reach 85.4% at a gas flow rate of 100 m3·h－1，liquid gas ratio of 20 L·m－3，high gravity factor of 90 and urea concentration of 20%. After continuous operation for 30 d by two stages，the average absorptivity was higher than 96% and the system operated stably. The rotating packed bed has broad prospect of industrial application for its advantages of smaller occupation of land，smaller investment，easier operation and higher absorption efficiency.