Abstract: Based on the variation principle, the corresponding finite element equationsfor the thermoelstic and heat conduction equations are obtained. The finiteelement equations for the fluid-solid interface waves propagated along thewater-aluminum, air-aluminum interfaces are solved by using the numericalmethod of integration, and then the transient waveforms excitedthermoelastically by a pulsed laser line source are obtained. The resultsshow that the leaky Lamb wave exists at the liquid-solid interface and alsoexists at air-solid interface; in reverse to the Lamb wave, the S_0 modeof leaky Lamb wave is antisymmetric, and the A_0 is symmetric; due tothe difference of the two kinds fluid-solid interfaces, the waveforms andamplitudes of the two leaky Lamb waves are different.