The energy leakage rate of Rayleigh wave generated by a laser pulse applied on a fluid-solid interface was analyzed. Data were presented for different fluid-solid interfaces based on the overall solution of wave motion, which was obtained by using finite element method. The results show that the energy leakage rate increases linearly with the increase of acoustic impedance ratio of the fluid and solid material, and that the increase in acoustic impedance matching of those two materials will be able to increase the acoustic leakage of Rayleigh wave and the excitation efficiency of leaky Rayleigh wave.