Abstract: After the "ultra-low emission" transformation of China's active supercritical and ultra supercritical coal-fired power plants, high-temperature corrosion of the water wall in the boiler occurs frequently, which seriously endangers the stable and safe operation of coal-fired power plants. High temperature corrosion is an important engineering problem to be solved in coal-fired power plants. Based on the study of high-temperature corrosion mechanism and numerical simulation, this paper analyzed and summarized the numerical simulation and engineering application of high-temperature corrosion wall attached air transformation in coal-fired power plant, Research shows: High temperature corrosion is easy to occur in reducing atmospheres such as low O2, high CO and H2S; Using low NOx staged combustion, burning and mixing low-quality coal and high sulfur coal is an important inducement for