Recently, I have been studying the Lamb wave excitation efficiency analysis in composite materials, and I have obtained the Lamb wave excitation efficiency of different modes through the normal mode expansion method. However, the experimental results are inconsistent with the theoretical analysis. I think I should have ignored the attenuation of composite materials. The material I used is T300/QY8911, but I do not know the complex stiffness matrix of this material now. If someone has done this kind of work, can you share the relevant material parameters. In addition to that, I used the data in this paper for analysis (Ultasonic guided wave monitoring of composite wing skin-to-spar bonded joints in aerospace structures). The results of my semi-analytic finite element program are not consistent with the Dispersion Calculator v2.2. If someone can solve my problem, I would be very grateful.