Geostationary orbit (GEO) satellite-borne laser communication antenna suffers from solar intrusion near midnight every day. In order to analyze the influence of midnight solar intrusion on the temperature of the optical antenna, a thermal analysis model of the laser communication terminals on the geostationary communication satellite is built, and temperature variations of the optical antenna are calculated．According to the analysis results, when the solar declination is ±8.8°, the midnight solar intrusion has more influence on the temperature of the main mirror and the secondary mirror than that of 0° solar declination. Effects of the midnight solar intrusion on the temperature of the optical antenna can be effectively reduced by using the optical antenna sunlight avoidance strategy. When the maneuver angle is 40°, by choosing a time combination of start time being 2.0 h before midnight and stop time being 2.5 h after midnight, the maximum continuous working time can be obtained.