The unstable operation of the CINRAD/SA radar servo system is analyzed, and abnormal radar echoes, which are mainly caused by servo faults, the overrunning and jumping of positioning of radar azimuth pitch, are divided into three categories. We study the quality control method of the overrunning, jumping, and faults of azimuth pitch positioning of the radar servo system from the radar base data, which can timely detect the abnormal echoes problems of radar, release the warning message, guide the maintenance in time, control the generation of abnormal echo data induced by the radar servo system from the sources, and improve the radar data and product quality.