Abstract: This paper introduces some application cases of using A-scan manual ultrasonic pulse reflection method in the testing of the shaft mount brake disc hub connection cracks. According to the characteristics of a particular artifact, the relevant process parameters and process validation of the method were determined, such as the incident angle and the frequency of the probe, the chip area, wave type, scanning area, probe size, physical block production, sensitivity calibration, and the setting of reference wave. The in-situ testing showed that this method could detect the cracks of train axle mounted brake disc hub connecting seat effectively.