Aiming at the information support capability of optical imaging satellite in information warfare, the threat of optical imaging satellite is evaluated. Considering the reconnaissance quality, coverage ability and timeliness from the perspective of optical imaging satellite application efficiency, a threat assessment index composed of resolution, horizontal positioning accuracy, imaging area, average access time and average revisit time is established. Based on the two typical subjective and objective weighting methods of analytic hierarchy process and entropy method, the combined weighting method is used to calculate the threat assessment. The simulation results show that the threat assessment results obtained by this method have certain interpretation and rationality, and the good combination of subjective will and objective commensurability is realized.