Combined with the CINRAD/SA radar antenna dynamic control process, structural characteristics, and symptoms, the basic processes of antenna operation are analyzed theoretically, and it is pointed out that the main reasons for radar pedestal dynamic faults occurred often in CINRAD stations are the mismatch of the actual position and dynamic rate of the antenna runs and the commands given by the RDA (Radar Data Acquisition) computer to the radar servo control system, and the mismatch of conditions and locations of the radar antenna. An indepth analysis is conducted on the working status of the key components such as the D/A converter circuit and speed compatible circuit, and the troubleshooting is conducted by means of such methods as drive chain, slip ring maintenance, and servo motor check, so as to provide references for the onsite maintenance of CINRAD/SA radar antenna failure.