卫星间直接光通讯中，由于卫星处在大气层外，所以必须同时考虑太阳、地球和大气辐射的影响。本文通过对太阳辐射、大气辐射及地面辐射的分析，根据卫星间光通讯的特点，找出了适于卫星间光学通讯的光波波长范围－０．２μｍ以下的真空紫外波段。在该范围内，能使各干扰因素达到最小状态，从而使在此范围内的卫星间光学通讯做到噪声低，抗干扰能力强。 In satellite direct optical communications, since satellites are in the atmosphere, the effects of the sun, the earth and the atmosphere must be considered simultaneously. Based on the analysis of solar radiation, atmospheric radiation and ground radiation, this paper finds the vacuum ultraviolet band of optical wavelength range -0.2μm for optical communication between satellites according to the characteristics of optical communication between satellites. Within this range, each interference factor can be minimized, so that the optical communication between the satellites in this range achieves low noise and strong anti-interference ability.