Abstract: Topography camera of Chang'e-3 probe is installed directly exposed to the high temperature environment of the lunar surface.The high temperature environment is great challenge to the thermal control design. To solve the high temperature problem,the best radiation position was presented as the core  of thermal design based on the heat flow analysis.The topography camera could obtain suitable initial temperature and fastest cooling rate when it was located at the best position.Meanwhile,the infrared radiation of the lunar surface was reduced as much as possible by arranging the radiator position appropriately and wrapping the camera with multilayer insulation.The telemetrydata of the topography camera meet the requirements of the storage stage temperature and have a large margin.Considering one-circle photograph,the topography camera temperature meets the operating temperature requirements,and the results are in good agreement with the thermal analysis.The thermal control design for the topography camera is proved to be correct and can be referred by the devices with similar problems of the deep space exploration field.

Key words: Thermal control design, Lunar environment, Radiator, Topography camera, Lunar surface probe, Chang'e-3