We　have　measured　the　temperature　raised　by　laser　irradiation　on　the　basis　of　difference　between　Stokes　and　anti-Stokes　Raman　scattering　cross-sections,　and　further　estimated　the　thermal　conductivity　of　the　material.　GeSbSe　glasses　with　compositions　of　GexSb10Se90-x,　GexSb15Se85-x,　and　GexSb20Se80-x　are　systematically　studied　with　the　aim　of　verifying　the　practicability　of　the　new　method　and　understanding　the　role　of　chemical　composition　in　determining　the　structure　and　thermal　conductivity　of　the　glasses.　All　of　the　results　are　in　agreement　with　those　reported　on　thermal　conductivity　measured　by　different　methods　in　the　literature.　It　is　indicated　that　Raman　scattering　method　is　convenient　and　efficient　to　measure　thermal　conductivity　of　the　materials.　For　each　group　of　glasses,　it　is　found　that　the　thermal　conductivity　increases　with　increasing　Ge　concentration　up　to　a　transition　point　corresponding　to　the　glass　with　chemically　stoichiometric　composition.　We　ascribe　the　threshold　behaviour　of　the　thermal　conductivity　to　the　demixing　of　the　structural　units　from　glass　network.