Abstract: In recent years, with the significant changes in the load structure of the power grid and the rapid growth of new energy installed capacity, the fossil-fuel power station is under great pressure of peak load regulation. In order to meet the demand of peak shaving in power industry, this paper analyzes the current situation of deep peak shaving of thermal power units in our plant and other units. In order to ensure the safe, stable and economical operation of the unit under the condition of deep peak shaving, the optimization work is carried out on the control strategy of the important auxiliary equipment, especially on the reliability of the high-pressure steam source of the steam-driven feed pump.