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Abstract: After the successful launch of Chang'E-1 lunar satellite, more deep space probes of non-earth orbit will be developed. Since the thermal control requirements for deep space probes ( such as lunar probe and Mars probe ) are very different from those for spacecraft in earth orbit, sufficient thermal environmental simulation tests for the probes have to be performed on ground in order to validate rationality of their thermal design. However, most of test facilities in our country are constructed to simulate in-orbit environment of geostationary spacecraft, which could not well meet the requirements of deep space exploration. This paper discusses the simulation technology of the non-earth orbit thermal environment in deep space.