The spacial thermal-cycle tolerance of the substrate based on domestic high-modulus carbon fiber （CCM40J-6K） was a key factor that determine whether it can be applied to solar cell panels on a large scale， and the matching between the panel and the solar cell and the on-orbit service life for solar cell panel in the alternating thermal environment must be solved. The solar cell panel based on domestic high-modulus carbon fiber/epoxy composite of CCM40J-6K was taken as the research object， and the test research of thermal-cycle environmental adaptability was carried out. In this paper， tests had been carried out from three aspects： the comparison of domestic and imported carbon fiber substrates for adapting to the capacity of high and low temperature alternating， the ability of domestic carbon fiber substrates to adapt to thermal environment after laying solar circuits， and the on-orbit service life of solar cell panels. The test results show that the comprehensive performance of the solar cell panel based on domestic carbon fiber CCM40J-6K is comparable to that of the imported M40JB-6K. The CCM40J-6K substrate has a good matching with the triple-junction GaAs solar cell. The change rates of open-circuit voltage and short-circuit current of solar cell panels based on domestic carbon fiber after fatigue thermal cycling are 0.55% and 0.24%， respectively. The appearance of the solar cell and cover glass is intact， the solar cell circuit is insulated from the polyimide surface of the substrate， and the surface of carbon fiber has no debonding phenomenon. It shows that the domestic carbon fiber CCM40J-6K can be used in the development of solar cell panels for solar array.