Secondary radar is an important component of air traffic control and belongs to surveillance equipment. Secondary radar, along with primary radar, Automatic Dependent Surveillance-Broadcast (ADS-B), field monitoring radar, and other monitoring equipment, together form the "eyes" of the controller. The article analyzes the causes of azimuth increment pulse anomalies in DLD-100C secondary radar, and proposes a complete disposal process based on practical troubleshooting ideas. This method can quickly and effectively identify and repair the problem of abnormal azimuth increment pulses in secondary radar.