The　mechanical　properly　of　composite　T300/AG80　is　tested　under　room　temperature　and　laser　irradiation.　The　longitudinal　and　transverse　effective　elastic　module　and　the　tensile　and　compressible　failure　strength　of　the　composite　are　obtained.　Laser　parameters　influencing　mechanical　property　of　the　also　analyzed.　The　wavelength　of　continuous　wave　laser　Nd:　YAG　is　1064nm　in　the　test.　Under　the　different　tensile　pre-stressing,　ablation　failure　mechanism　and　trend　of　mechanical　property　influenced　by　intensity　of　laser　are　analyzed　and　the　experimental　process　is　recorded　by　high　speed　camera.　The　failure　time　of　the　composite　under　laser　irradiation　is　obtained　by　numerical　simulation　and　it　is　considered　with　that　of　experimental　ones.