Abstract: At any time, the overall load rate of coal-fired power units is decreasing year by year, and the difference between the peak load and the peak load between day and night in the power grid is getting larger and larger, the space for power generation in the fossil-fuel power station has been severely compressed, and deep peak shaving has become the new normal. In addition, in recent years, the state has imposed a number of emission reduction reforms on large fossil-fuel power station to meet emission reduction targets, it has also increased the resistance of fossil-fuel power station power equipment and systems, increased the coal consumption of power supply and the rate of auxiliary power consumption, and basically completed the large-scale energy-saving transformation, further realizing cost reduction and efficiency increase under the new situation, we can only optimize the operation mode of the unit and explore new ways to save energy and reduce consumption. Some practices of our plant in energy saving and emission reduction have achieved better results and are worth popularizing and applying.