Various low-NOx combustion technologies,such as air-staged,are currently widely used in coal-fired boilers to reduce NOx concentration at furnace outlet. However,in practical application,these technologies cause sulfidation corrosion of the boiler water-wall,and affect the safe operation of pulverized coal boiler. In order to accurately predict the concentration of H2S near the boiler water wall,the gas-phase kinetics software Chemkin software was used to evaluate and simplify the established detailed reaction mechanism model of H2S generation. First,in this paper,the coupling between the detailed reaction mechanism model of sulfur species and the detailed reaction mechanism of C/H/O was verified,which showed that GRI-3.0 could better predict the concentration distribution of important components in pulverized coal-fired boiler with air-staged. Then,the coupling mechanism model was taken as the initial mechanism and compared with other detailed sulfur reaction mechanisms. The results show that the detailed reaction mechanism model of sulfur species in our research group can better describe the evolution of gaseous sulfur species during pulverized coal combustion,and CS2 is considered as an important sulfur species to better predict the concentration distribution of sulfur species. Finally,by comparing the simplified results,the result obtained by the directed relation graph with error propagation(DRGEP)is selected as the simplified reaction mechanism model of the sulfur species,including 15 species and 28 reactions,which has been verifying in the temperature range of 1 373-1 673 K. The results show that reduced mechanism model can be applied to the prediction of the sulfur species concentration distribution during the fuel-rich combustion of pulverized coal.