To　avoid　the　angular　deformation　of　T　joint　in　high-strength　aluminum　alloy　plate　of　large　aircraft,　a　method　that　equips　skin　back　with　auxiliary　heat　source　(AHS)　is　proposed　to　prevent　angular　deformation　effectively.　A　welding　model　applicable　to　this　welding　method　is　developed　based　on　finite　element　software　ABAQUS,　the　material　and　geometrical　nonlinear　finite　element　methods　and　the　thermal-elastic-plastic　finite　element　method　for　moving　heat　source　are　applied　to　simulate　the　thermodynamic　coupling　behavior　as　well　as　to　analyze　the　temperature　field,　residual　stress　and　welding　deformation　in　welding　process.　The　deformation　of　the　weld　joint　before　and　after　the　addition　of　the　AHS　is　measured　by　experimental　method.　The　findings　show　that　the　flexural　deflection　and　angular　deformation　achieved　through　numerical　computation　completely　consist　with　the　experimental　result,　which　has　proved　the　effectiveness　of　the　finite　element　methods　developed.　©,　2015,　Science　Press.　All　right　reserved.