In this paper,the method of CFD numerical simulation is used to simulate the combustion status of the boiler after the low-NOx combustion modification,and the NOx generation situation after the low-nitrogen combustion modification of the boiler is measured.The appropriate SNCR modification scheme is determined by calculation,and the NOX emission values before and after low-nitrogen combustion and SNCR modification are calculated and predicted,providing a theoretical calculation basis for engineering applications.