influence of human body targets spectral characteristics on visual range of low light level image intensifiers to study the effect of different human targets spectral reflective characteristic on low light level lll image intensifiers distance based on the spectral characteristics of the nightsky radiation and the spectral reflective coefficients of common clothes we established a equation of human body targets spectral reflective distribution and analyzed the spectral reflective characteristics of different human targets wearing the clothes of different color and different material and from the actual detection equation of lll image intensifier distance discussed the detection capability of lll image intensifier for different human target the study shows that the effect of different human targets spectral reflective characteristic on lll image intensifier distance is mainly reflected in the average reflectivity rho and the initial contrast of the target and the background c0 reflective coefficient and spectral reflection intensity of cotton clothes are higher than polyester clothes and detection capability of lll image intensifier is stronger for the human target wearing cotton clothes experimental results show that the lll image intensifiers have longer visual ranges for targets who wear cotton clothes than targets who wear same color but polyester clothes and have longer visual ranges for targets who wear lightcolored clothes than targets who wear darkcolored clothes and in the full moon illumination conditions lll image intensifiers are more sensitive to the clothes material