The measures to enhance the laser-acoustic conversion efficiency of laser generation of acoustic waves through thermoelastic mechanism are discussed firstly based on the theory of the interaction of pulsed laser radiation with liquid,and the effects of the characteristic of different liquid media on the conversion efficiency are analyzed specially.And then the feasibility to enhance conversion efficiency using a Helmholtz resonance photoacoustic cell is discussed based on the theory of a Helmholtz resonator which has the capability of amplifying acoustic waves of a certain frequency.At last,when the repeatability and controllability of the acoustic waves are not required strictly,to enhance laser-acoustic conversion efficiency,it is feasible to adopt high-power lasers to induce acoustic waves through vaporization or optical breakdown mechanism.