Nondestructive　testing　plays　an　important　role　in　modern　cities.　Laser-generated　surface　acoustic　waves　(SAWs)　are　widely　used　in　the　nondestructive　testing　of　structures　due　to　their　advantages,　such　as　being　non-contact　and　having　a　wide　frequency　bandwidth,　long　distance　propagation,　little　attenuation,　and　so　on.　Q345　steel　is　currently　used　in　many　areas,　especially　in　large　structures.　In　order　to　utilize　laser-generated　SAWs　more　reasonably,　this　paper　discusses　the　effects　of　laser　parameters　on　the　excitation　of　SAWs　in　Q345　steel　with　the　numerical　method.　The　three　parameters　of　the　pulse　energy,　rise　time,　and　pulse　width　are　discussed　separately.　The　results　show　that　the　amplitude　of　displacement　is　directly　proportional　to　the　pulse　energy　and　inversely　proportional　to　the　rise　time　and　pulse　width.　These　proposed　results　can　provide　a　guideline　for　the　choice　of　the　excitation　parameters　in　the　laser-generated　SAWs　nondestructive　evaluation　on　Q345　steel.　©　2023　SPIE.　All　rights　reserved.