Abstract: WPS is a new-typed water-soluble anion surfactant,and can be used as an oil-displacement agent for tertiary recovery.Under the cooperation between East China Bureau of Petroleum and Anqing Petroleum and Chemical Factory,a WPS tertiary recovery field test project was developed in Chujialou oil field.During the project,WPS oil-displacement agent was injected by 50.3t cumulatively,the injection concentration was 0.5%,and the total injected fluid amount was 10057.70m³.By field monitoring and comparaive analysis,the expected results of decreasing water content,increasing oil daily production and poor oil properties were obtained in the two observation wells,and the cumulative increased oil production was 506.79t. The field test approached to the new path of tertiary recovery,which had more obvious economic benefits and fulfilled and the test targets of oil increasing,water control and reservoir recovery raising.