Abstract: Aiming at the structural design and requirements of photonic crystals in infrared stealth,the optical transmission matrix of multi-layer thin film system is constructed by solving Maxwell equations, which provides a solution of material selection and structure optimization for photonic crystal stealth at 3—5 μm and 8—14 μm. The infrared high reflection state of [Si/MgF₂]N multi-layer was deduced by selecting high refractive index material Si and low refractive index material MgF₂. Starting from the wave optics theory, the latest progress and related principles of one-dimensional photonic crystal infrared stealth technology are introduced. The effects of incident angle, period number, size and refractive index on the infrared stealth effect of photonic crystal are calculated. The results show that, besides structural optimization, the choice of materials also need paying attention to in order to achieve that the infrared stealth in complex working conditions.