Abstract: A finite element method was used to investigate the lamb wave propagation in aluminum adhesive joints. Using 2D-FFT to recognize the modes, the simulation results were compared with the theoretical results. The experiment results showed that the simulation was accurate and effective. It was approved that the lamb wave propagation is multi-mode and dispersion. The method of 2D-FFT can effectively identify the Lamb wave modes, the test results agree well with the results of the finite element analysis.