Abstract: ABSTRACT: This paper analyzes how the wet desulphurization system of thermal power plants can reduce plant power consumption and water resource use, mainly from three aspects: normal operation stage of the unit, start-up preparation and shutdown stage, and targeted small technical reform. At the same time, taking the desulphurization system operation technical reform of each unit in Shangan power plant as an example. The paper further explains the importance of finding safe and reliable energy saving methods in desulphurization system.