Abstract: It adopts the AC servo motor to be the drive component, the thought of which has changed the tradition designing style ofadopting DC servo motor. Double-motor drive can reduce the system failure rate greatly and raise the drive system's MTBF. It adopts swell cover device in many places, which can improve effect in dismantling and assembling. At the same time, it is convenient to defend the system. The drive system is developed to have features of light weight, small volume, convenience in assemblingand high-tracking accuracy. The choice of tracking radar antenna's drive system has been introduced systematically and the designprocedures of transmission chain and accuracy analysis has been introduced especially in the article.