Abstract： In order to explore the influence of laser parameters and the photoacoustic conversion layer's thickness on the output pressure of the photoacoustic transducer,the physical model of the photoacoustic transducer was established by COMSOL simulation software.Firstly,based on polydimethylsiloxane(PDMS)and carbon nanotube(CNT),the conversion layer models of CNT and CNT-PDMS were established,respectively.Secondly,the laser pulse duration and thickness of the conversion layer were varied to measure the output sound pressure of the conversion layer.Finally,the changes in the transducer output sound pressure intensity caused by the laser pulse duration and the thickness of the conversion layer were analyzed.The results showed that the transducer could output ultra-sonic waves with higher sound pressure intensity when the thickness of both CNT and CNT-PDMS conversion layers was 200 μm,and the laser pulse duration was 10～30 ns and about 50 ns,respectively.These simulation results have certain guiding significance for the research of photoacoustic transducer.