Abstract: Aiming at the detection threat on photoelectric equipment caused by active laser detection technology, the stealth technology by weakening the cat's eye effect was studied in this paper. Take the night vision objective lens as an example, the stealth technology was studied quantitatively by means of matrix optics tracing, and was proved by experiments. The results show that the echo intensity of the cat's eye effect was affected easily by reconnaissance environment and system assembly errors, such as the tilt and the defocus of photosensitive surface. Thus, under the premise of the limited change optical structure of photoelectric devices and the reduction of their image quality, some assembly errors created artificially can weaken the cat's eye echo of the system, so as to achieve stealth. This technology can effectively reduce the probability of being detected and attacked by the enemy in military confrontation, so it has certain reference value in the military. Key words: stealth technology; echo; cat's eye effect; matrix optics