Abstract: In the paper, an ammonia/oxygen-rich porous media combustion experiment platform was designed and built, and porous media panels with good consistency in structure and function were prepared by using 3D printing technology. The effects of the structure and material of porous media on the ammonia combustion start-up characteristics, panel temperature and flame morphology under oxygen-rich conditions were studied. The results show that ammonia can be stably burned in porous media when the oxygen enrichment rate is 0.28～0.38, and the combustion flame is partial or full immersion combustion according to different working conditions. The pore density of the porous media panel has a great influence on the ammonia combustion performance, the smaller the pore density, the higher the average temperature of the panel, but there is an optimal value for the system startup time and stable temperature. In terms of material, the alumina ceramic and SUS304 stainless steel panels show little difference in system start-up time and steady-state temperature. However, the average temperature of the alumina ceramic panel is generally higher than that of the SUS304 stainless steel panel. The results can provide validation for numerical research and guidance for the industrial application of porous medium combustion of ammonia fuel.