Aiming at the problemswith the circulating cooling water in Dushanzi Oil Refinery,a seriesof improv-ement measures,such asthe selection of scale and corrosion inhibitorsand bactericidesand their feeding project ;technical improvement of water coolers ;and the side-filtration system ;the control of material leaking ;and the reinforcement of systematic and scientific management,etc.,have been taken.Remarkable resultsand visible econ-omic profitshave been obtained.In addition.These experiencescan offer reference for the circulating cooling water quality improvement in other oil refineries.