Abstract: In the thermal vacuum test on the ground, the traditional infrared heating array often affects the deformation measurement. For example, the belt may hinder the working of antenna, and then affect the temperature gradient. In order to improve the accuracy of tests, a new method is proposed for the antenna's thermal vacuum test, that is to keep the antenna in a rotation state in the thermal vacuum environment. The temperature field distribution of the antenna is obtained by the virtual thermal vacuum test platform, which is verified by the further experimentation. Compared with the test data, the simulation results are reliable.