With the intensification of industrialization,nitrogen oxides(NOx)emitted by power plants have become one of the main sources of air pollution,posing a serious threat to the environment and human health.The denitrification process,as an important pollutant control technology,is widely used in power plants.Based on this,this article explored the principle of denitrification process and its application in power plants,analyzed its impact on NOx emissions,and provided important reference for controlling air pollution.