Abstract: In this paper, the thermal control designs of polar orbit lunar satellites are summarized, and take a polar orbit lunar satellite with solar panels in single degree of freedom as an example. Then, the analysis of this satellite about its outer heat flux and heat dissipation in space are conducted when it is flying towards the moon and orbiting around the moon. Based on the results of the analysis, the thermal design scheme of this lunar satellite is presented, and the problems about the thermal control of the payloads, the problems about the thermal control of the instruments and equipment on the ±y side, and the application of the thermal louver technique are described.