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The test block is one of the important equipment for ultrasonic testing. In the process of pulse reflection ultrasonic testing, the quality of the inspected material or workpiece is characterized by the static and dynamic characteristic variables of the reflected echo position, height, and waveform on the instrument's fluorescent screen. However, the acoustic relationship between these variables and defects is very complex, and there are also various influencing factors such as instruments and probes, materials or workpiece materials, and adhesion conditions. Therefore, it is not enough to rely solely on adjusting the relevant knobs on the instrument and simple calculation results to complete tasks such as qualitative, quantitative, and localization of defects.