In order to study the infrared stealth effect of photonic crystal films in practical application scenarios， photonic crystal films and low emissivity films with mid- and far-infrared stealth performance were selected， and the engine compartment of a Jeep was taken as the object of study to analyze the effects of self-radiation and radiation from the reflected environment on the stealth effect. A photonic crystal film with mid- and far-infrared stealth effects was designed and fabricated， and then the effects of the films on the stealth effect of the engine compartment were tested during daytime and nighttime， respectively. The results show that solar radiation has less influence on the mid- and far-infrared stealth effect of photonic crystal films， and that photonic crystal films can better achieve object and background fusion. The work demonstrates that photonic crystals are better than low emissivity films in mid- and far-infrared stealth.