The ultrasonic nondestructive testing of CFRP components is critical to analyse the predisposition of defects and improve the manufacturing quality, which is directly related to the reliability of the aero products. In this study, an I-Shaped CFRP specimen was concerned. The ultrasonic properties were characterized and the ultrasonic field of PAUT was simulated. Based on these results, the testing parameters were optimized and PAUT inspection was conducted for the plate and curved part respectively. The results show that the longitudinal velocity perpendicular to the plate has a weak dependence on the testing frequency and the plate thickness. The attenuation coefficient of amplitude in time domain increased sharply with the elevation of the testing frequency. The optimized aperture and focal depth were achieved. By means of the above results, sectorial and electric scanning profiles were performed on the plate and curved part in PAUT inspection. Moreover, the depth information of subsurface defects was determined in virtue of spectrum analysis technique.

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