The study of restaurant wastew ater treatment is conducted with a new-style combined packing biological tower .The influence of this tower inlet COD on dissolved oxygen concentration in the tower and on the stability and endurance of the bio-film has been investigated experimentally .The comprehensive effects of hydraulic retention time and the ratio of air flow rate to restaurant wastewater flow rate on the wastewater treatment results have been studied experimentally .The results show that the long-term operation of bio-packing tower under high concentration of COD is harmful to the stability and endurance of the bio-film , that the proper hydraulic retention time of the wastewater is about 3 ～ 4 h , the optimal ratio of air flow rate to restaurant wastewater flow rate is about 8 ～ 12 in consideration of removal efficiency and power consumption simultaneously , and that the combined packing is superior to the coke in restaurant wastewater treatment .