Triple-junction　GaAs　solar　cells　were　irradiated　by　nanosecond　pulse　laser　with　a　wavelength　of　1064nm,　in　atmospheric　and　vacuum　environments　respectively　to　study　the　damage　characteristics　of　triple-junction　GaAs　solar　cells　irradiated　nanosecond　pulse　laser　in　different　environments,　and　the　damage　effects　of　pulse　laser　in　two　environments　were　compared　and　analyzed.　The　experimental　results　show　that　the　damage　of　solar　cells　irradiated　by　nanosecond　pulse　laser　is　significantly　affected　by　the　target　energy　density,　and　the　damage　effect　is　positively　correlated　with　the　number　of　pulses,　which　increases　with　the　number　of　pulses.　Due　to　the　high　peak　power,　short　action　time,　no　obvious　thermal　effect　of　the　action　process,　and　no　material　migration　phenomenon,　the　damage　effect　of　solar　cells　is　similar　under　pulsed　laser　irradiation　with　the　same　parameters　in　different　environments.　©　2023　SPIE.