Abstract: The cable-membrane-truss antenna works in the harsh space environment, which will cause ultra-high temperature when facing the sun and ultra-low temperature when entering the earth shadow, and the huge temperature gradient created by periodically entering and leaving the earth shadow, thus the surface accuracy of the antenna will be reduced. In order to ensure the high thermal stability of satellite-borne antenna, it is necessary to study the main parameters that affect the temperature field in orbit. To solve this problem, in this paper the main thermal physical parameters of the material are changed, and the parameters that have the greatest influence on the temperature field in orbit are found through the simulation results. Firstly, based on the principle of heat energy conservation, the thermal analysis model of antenna with and without thin membrane structure is established. Then, taking a peripheral truss antenna with a diameter of 30 m as an example, the influence of the thin membrane structure on the temperature field of the satellite-borne antenna in orbit is simulated and analyzed. The simulation results show that the heat conduction and shielding effect of the thin membrane structure have a great influence on the temperature field. Finally, the main factors affecting the in-orbit temperature field are obtained by changing the main thermal physical parameters of the material, and the parameter combination of minimum temperature gradient is obtained.