Abstract: Traditional low-light-level(LLL) image intensifier and the image intensifier with InGaAs photocathode extending to shortwave infrared(SWIR) band were compared and analyzed,and the materiel characteristic of InGaAs was analyzed of which the response band could cover the main band of the night sky radiation through adjusting the component of InGaAs. It is revealed that the image intensifier with InGaAs photocathode has higher quantum efficiency and responsivity. The researching status home and abroad was presented. The response of InGaAs photocathode image intensifier is 100~1 000 times larger than the traditional image intensifier at shortwave infrared hand and the InGaAs detector can work between 0.4 m~1.7 m, the quantum efficiency is more than 80% between 0.9 m~1.7 m. It is indicated that this kind of image intensifier can be applied in laser detection, orientation at far distance, intelligence reconnaissance and assistant driving at night.