In　order　to　study　stress　distribution　of　thermal　barrier　coatings　on　the　gas　turbine　blade　in　the　process　of　cooling,　the　finite　element　analysis　software　ANSYS　is　used　to　perform　the　micro　two-dimensional　coating　system.　The　inhomogeneous　temperature　distribution　and　stress　distribution　is　got　through　the　thermo-mechanical　indirect　coupling.　Effect　of　roughness　by　the　sinusoidal　TGO　on　σx,　σy,　τxy　is　taken　into　account.　Through　stress　components　distribution　between　the　upper　and　lower　interfaces　of　the　oxide　layer,　where　the　location　is　easily　to　initiate　crack　is　obtained/Corresponding　calculating　results　show　that:　(1)　The　maximum　value　of　σx　appears　at　the　top　of　BC　layer,　the　largest　value　of　τxy　appears　at　the　middle　of　TGO　layer.　(2)　The　maximum　σy　appears　at　the　top　of　interface　and　gets　the　largest　stress　step.　The　TGO/BC　interface　is　easily　to　initiate　delamination　damage.　(3)　The　variation　trend　of　σy　and　τxy　is　consistent　with　the　roughness　by　changing　the　amplitude　or　wavelength.　When　the　roughness　AIT　greater　than　0.25,　σx　shows　the　pattern　of　increases　firstly,　and　then　decreases　under　the　condition　of　changing　amplitude,　while　decreases　firstly,　and　then　increases　under　the　condition　of　changing　the　wavelength.　©,　2015,　Xi＇an　Jiaotong　University.　All　right　reserved.