T91　steel　is　martensite　stainless　steel,　the　welding　performance　of　T91　steel　is　poor,　easy　to　produce　cold　cracking　and　reheat　cracking　when　welding,　and　the　welded　joints　is　easy　to　brittle.　Applications　of　Gaussian　heat　source　binding　element　birth　and　death　to　simulation　of　supercritical　boiler　steel　T91　welding　residual　stress　based　on　the　ANSYS　software　platform,　analysis　of　the　distribution　of　welding　residual　stress　field　and　discussed　the　preheating　temperature　and　the　post-weld　heat　treatment　press　for　welding　residual　stress.　The　simulation　results　show　that　the　welding　residual　stress　concentration　in　the　weld　zone　and　the　heat　affected　zone,　the　maximum　equivalent　stress　exceeds　the　yield　stress　value,　and　preheating　temperature　increase　can　reduce　the　Mises　equivalent　residual　stress,　but　stress　is　still　large,　and　post-weld　heat　treatment　can　significantly　improve　the　distribution　of　welding　residual　stress,　the　maximum　stress　value　decreased　60%　to　70%.