Abstract: To clarify the wave propagation behavior in the radii of carbon fiber reinforced plastics (CFRP) components with complex geometry, the elastic property characterization, finite element modeling, wave field calculation and experimental verification were carried out for phased array ultrasonic testing (PAUT). Based on a back-reflection ultrasonic immersion method and a simulated annealing algorithm, the stiffness matrix of a unidirectional CFRP plate was inversely solved, and the elastic property in the radii was described quantitatively by Bond transformation. The material and geometric characteristics of the radii for multidirectional laminates were analyzed, and a finite element model of PAUT was proposed by considering the curved surface, layered structure and elastic anisotropy simultaneously. Furthermore, the A-scan and B-scan of PAUT were calculated and compared with the experimental results. A certain degree of structural noise is observed between surface echo and defect echo, and there are strong pseudo defects on the left and right sides. The transient wave field was compared with those in a CFRP plate, a unidirectional CFRP radii and an elastically isotropic radii. It is found that the coupling of the elastic anisotropy and the curved laminated structure are the main reasons for the above phenomena. When an ultrasonic wave is incident obliquely into the radii part, the mismatched acoustic properties of different layers result in the structural noise. When the wave runs into the ribbed plate, the echo is received by the probe after twice reflections and forms an image of the pseudo defects. The refraction part propagates along with the fiber rapidly into the radii, overlapping with the defect echo, and directly contributes to the structural noise. It is indicated that the high-quality reorganization of the defects in CFRP radii has been influenced by the coupling of the material and geometric factors.