This paper deals with servo tracking data of telemetry system, analyzes and compares several tracking methods, points out the possible problems in several tracking methods, and puts forward corresponding improvement measures. The stability and jump degree of antenna azimuth and elevation angle during autonomous tracking are studied through the attribute analysis of curve variation and variance. We analyze and compare with the curve stability of theoretical trajectory and digital guidance. The conclusion is that the greater the variation, the worse the stability, and the bigger the variance, the more obvious the abnormal jump.