Grid-stiffened　cylindrical　shells　are　widely　applied　in　aviation　and　aerospace　engineering.　Bearing　capacities　of　grid-stiffened　cylindrical　shells　will　be　reduced　by　local　heating.　In　this　study,　numerical　simulation　method　is　applied　to　deduce　the　temperature　distribution　of　the　grid-stiffened　cylindrical　shells　subjected　to　high　power　laser　irradiation.　Temperature　dependent　aluminum　alloy　properties　are　fully　considered　in　the　process　of　numerical　simulation.　Comparing　to　smooth　thin-wall　cylindrical　shells,　the　effect　of　ribs　size　to　temperature　distribution　is　studied.　As　the　material　properties　varying　with　temperature,　the　temperature　rising　rate　is　higher　at　the　initial　period　when　cylindrical　shell　is　subjected　to　laser　irradiation.　The　temperature　rising　rate　gradually　reduces　with　irradiation　time　increasing.　Buckling　analysis　was　performed　to　obtain　the　buckling　bearing　capacity　and　the　effect　of　local　heating　on　grid-stiffened　cylindrical　shells　subjected　to　local　heating.