In this paper, we mainly investigate the seismic characteristics of the antenna servo system. When a large earthquake occurs, the antenna deviates from the satellite and the system can automatically correct the antenna attitude to re-align the satellite and resume communication in a short time. To overcome the possible azimuth, we have added two calibration devices to this system:the inclinometer and electronic compass. We fixed the inclinometer at the back of antenna surface along the beam direction. Because its output value is absolute, even in the case of antenna tilt or structural distortion, the accuracy will not be affected. We fixed the electronic compass on the antenna base, and its output value can be set as the reference azimuth angle for normal work. This system can ensure the normal use of the fixed satellite communication earth station following any initial accident, and can thus play a positive role in our emergency rescue ability.