Abstract: In order to measure the thermal deformation of the spaceborne high precision deployable antenna with solid surface and analyze its influence on the antenna profile and the pointing accuracy, this paper takes a certain antenna of this type as the object and, with consideration of the specific structure of the antenna and various measurement environments, proposes related methods for measuring the thermal deformation of the antenna reflector and the antenna pointing in the atmospheric environment and the vacuum environment, respectively. Measurements are made with these methods. With appropriate data processing and analysis, the quantitative analysis and the calculation of the thermal deformation of the deployable antenna with solid surface are realized.