Photonic crystal (PC), conventional camouflage fabric and infrared stealth coating are used as testing sample, which is attached tightly to a heater with a temperature of 60 ℃ respectively, to perform infrared stealth experiment in outdoor environments. Experimental results show that sunlight affects 8-14 μm waveband stealth effect of PC slightly, while 3-5 μm waveband is also the same in most angle range. Radiation from walls and atmosphere has a little effect on 3-5 μm and 8-14 μm stealth effects of PC. The PC has better infrared stealth performance in both middle and far infrared wavebands, compared with the other two conventional infrared stealth materials.