Abstract: Enhancing the effect of circulating cooling water treatment plays an important role in prolonging the actual life of heat exchanger and the operation period of the equipment, reducing cost and increasing benefit of the corporation. The relationship of the circulating cooling water treatment effect with the actual life of heat exchanger and the operation period of the equipment was analyzed. The conclusion can be drawn that the actual service life of the heat exchanger and the operation period of the equipment depend on the effect of circulating cooling water treatment. The excellent effect can ensure the actual life more than 18 years for the heat exchanger though the design life is only 8 years and the operation period of the equipment can be as long as 79 months. So it leads to an enormous economic benefit.