As the key component of space laser communication systems, optical antenna is required to have good stability and uniformity for temperature field. The thermal control technology for temperature field of antenna is facing more challenge owing to the large antenna aperture and the complex fusion of external heat flux in geostationary orbit space. According to the characteristics of antenna configuration and the discipline of external heat flux variation, the long-term fine stability control for the stability and the uniformity of antenna temperature field is achieved in large diameter optical communication when we combine the space efficient heat protection technology with the optical mirror aided thermal control technology, which is based on the design for optical, mechanical and thermal design. The proposed method is verified by thermal test. Experiment results show that in the case that the antenna is taken strategy to avoid direct sun, the duration is up to 14.3 h/d, which satisfies the request for antenna temperature. The temperature is controlled stably in the range of 21.4-26.2 ℃. The thermal difference of the primary mirror itself is not larger than 1.3 ℃, and the thermal difference between the primary mirror and the secondary mirror is not larger than 3.8 ℃. These results are larger than the required indexes of stability and uniformity.