Abstract: In this paper, an on-line monitoring system for desulfurizing and oxidizing air centralized control coupled with slurry oxidation is introduced. The system makes full use of the adjustment margin of the oxidation fan of a single furnace through the centralization of the main pipe, and gives full play to the overall advantage of the equipment and wind resource sharing of the multi-furnace and multi-tower air system. In addition, based on the accurate measurement of the oxidation link in the desulfurization tower by the slurry online monitor, the precise control and reasonable air distribution under the centralized control of the oxidizing air system are realized, and the desulfurization operation level of the coal-fired power plant is improved.