Abstract: Sound attenuation and speed change along with incidence angle of ultrasonic wave. According to the characteristics of phased array ultrasonic detection applied in anisotropic weld, a process scheme for obtaining the optimum incidence angle by optimizing the wedge-angle is designed. Firstly, electron back scatter diffraction technique is used to evaluate the texture of the weld. The anisotropy model was established based on Silk model. Secondly, CIVA simulation software is used to calculate the reflection amplitude corresponding to different wedge angles and detection distances. Finally, data are analyzed comprehensively to determine the optimal probe wedge angle for obtaining the optimal reflection amplitude of signal. The numerical simulation and test of butt weld specimens of small-diameter pipes (austenitic stainless steel) are carried out by using the optimized design scheme. The results show that the optimized probe wedge can be well used in testing the weld of austenitic stainless steel and locating the defect. This research work provides a feasible technical scheme for the inspection of austenitic stainless steel weld.