Abstract: The visible radiation characteristics of midcourse targets are very important for detecting, tracking and attacking a target. A computation method is proposed for the purpose. The bidirectional reflectance was computed. The visible radiation characteristics of a midcourse target, which were observed by the synchronous satellite, low orbit satellite and mid-orbit satellite during the daytime, was also calculated considering the solar visible radiation and the solar visible radiation reflected by the cloud. The research results show that the spectral variation of visible radiation from the target observed by the synchronous satellite is the same as that of the direct sunlight radiation, the spectral radiant flux of the target observed by the low orbit satellite is three orders higher than that observed by the synchronous satellite in magnitude, and the spectral radiant flux of the target observed by the midorbit satellite is one order higher than that observed by the synchronous satellite in magnitude.