Abstract: Under the background of the carbon neutrality goal and energy transition, ammonia has attracted extensive attention due to its potential as a zero-carbon fuel, offering advantages in storage, transportation, and industrial maturity. However, its low reactivity and high NOx emissions have restricted its application. Based on a dual-swirl burner, this study carried out a swirl combustion experiment of ammonia/hydrogen mixed fuel, investigating the effects of equivalence ratio, thermal power and hydrogen blending ratio on flame structure and pollutant emissions. The results show that as the hydrogen ratio increases, the flame morphology changes from "V" shape to "M" shape and then returns to "V" shape. The chemiluminescence intensity of radicals first strengthens and then weakens, and NOx emissions also exhibit a significant dependence on the hydrogen fraction.The flame height and chemiluminescence intensity both decrease with reductions in the equivalence ratio and thermal power. NO emissions decrease as the equivalence ratio rises. The research has revealed the effect of hydrogen blending on the combustion stability and emission characteristics of ammonia flames, providing experimental basis for the application of ammonia-based fuels.