The weld is a typical dissimilar metal weld (DMW). As its large grain, anisotropism and narrow moving space for probe, it is difficult for practical ultrasonic testing. On the basis of studying weld structure, this thesis firstly discusses the sonic propagation path of different incident angle, and then calculates the reflectivity and transmittivity, from which the ratio-angle curve will be plotted, finally simulates & analyzes the ultrasonic testing with software CIVA. The analysis results show that proper selection of the incident angle will provide suitable incident angle range for the following experiments. With the CIVA analysis results, it will also provide references for choosing proper probe parameters and relative technics for following research.

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