Abstract: In order to improve the signal-to-noise ratio (SNR) of surface acoustic waves (SAWs) in laser ultrasonic test, laser array, obtained by the temporal and spatial modulation of the line sources, was used to irradiate on the aluminum plate, and the physical processes, including the generation of SAWs (giant SAWs) with huge displacement amplitude and the interactions between the giant SAWs and the surface breaking crack were simulated by means of the finite element method. The numerical results demonstrate that the displacement amplitude of the giant SAWs generated by the laser array increases in proportion with the number of laser array elements. Besides, the amplitude of the reflected SAWs, generated by the interactions between the giant SAWs and the surface breaking crack, is also increased as the numbers of the line sources increased. The results can provide some hints for the utilization of the thermoelastic laser array to improve SNR of the SAWs.