Abstract: Single mirror assembly is one of the key components of remote sensor. It is a necessary means to obtain the measurement data and to verify the correctness of its structural design by testing its surface shape and stability under a deep cryogenic vacuum environment. In this paper, based on the ground verification test of a single mirror assembly, the deep cryogenic background of cryogenic lens under vacuum was established. The design, development and simulation test of the temperature control system were carried out by using the mechanical cooling technology of GM refrigerator. The product temperature control indexes of (60±1) K, (160±1) K, (200±1) K, and the temperature control range of 60 K to 300 K were realized. The cooling system provided an important guarantee measure for the surface shape and stability tests of the remote sensor optical lens in the deep cryogenic environment.