In order to control the fouling, fouling, jujube and corrosion caused by water quality in the circulating cooling water system, and ensure the heat transfer efficiency and the service life of heat exchange unit, the circulating cooling water should be treated. The working principle of the electrochemical water treatment system was introduced. The common problems in the treatment of circulating cooling water and the treatment arrount of circulating cooling water and the treatment cost of the commonly used chemical medicament water treatment technology and the electrochemical water treatment technology were compared.It was put forward that the electrochemical water treatment technology could effectively remove the contaminants in the circulating cooling water, which is a green environment-friendly water treatment method.