Based on the reaction path analysis method, the generation and consumption of NO_x（NO, NO₂, N₂O）and the NO_x chemical kinetic mechanism were studied. The NO_x mechanism was combined with the NH₃/H₂ combustion mechanism, and the fuel-type N^*O_x and air-type NO_x generation characteristics of NH₃/H₂ combustion were investigated using the elemental labelling method. The results show that the combined mechanism can accurately predict the ignition delay time, laminar burning velocity, and the concentration of important components in a wide range of equivalence ratios. Adding 50% H₂ does not significantly affect the oxidation pathway of NH₃. The addition of H₂ promotes the generation of large amounts of O, H, and OH radicals, which further promotes the oxidation of NH₃ and is the main reason for the significant increase in the generation of fuel-type N^*O and N^*O₂, as well as air-type NO, NO₂, and N₂O. The H radicals generated by H₂ combustion promote the conversion of fuel-type N^*₂O and fuel/air-type NN^*O, thus reducing the final production of both. In addition, fuel-type N^*O, N^*O₂, and N^*₂O dominate the NO, NO₂, and N₂O produced by pure NH₃ combustion or NH₃/H₂ combustion with a 50% H₂ ratio.