Abstract: The sewage in thick oil in Henan oilfield is characterized by hard biochemical feature and high water temperature; therefore,the technique of organic membrane hydrolysis a- cidification- catalytic oxidation is optimized on the basis of laboratory test and field experiment.Through following and monitoring the content of main nutrient matters,and in com- bination with the growth of microorganism and the removal effect of COD,a high-performance microbial nutrient is manufactured.After the field application,the content of mi- croorganism is increased and the removal efficiency is en- hanced,which assure the discharge standard of sewage.