Abstract: The three-dimensional thermal-structural coupling finite element model of T-shaped welded joint was developed by using ANSYS finite element software. The whole welding process of T-shaped joint was numerically simulated based on the thermal-elastic-plastic finite element method, and the residual stress distribution of T-shaped joint was obtained.Then the welding residual stress was used as the initial stress to simulate the post weld heat treatment process, and the influence of two different creep models on residual stress elimination in post weld heat treatment was discussed. The results show that there are large welding residual stresses and strong local distribution characteristics in the weld and nearby heat affected zone of T-joint after welding, and the longitudinal tensile residual stresses can be effectively reduced by considering the post weld heat treatment of creep. The stress release caused by creep of composite time hardening model is earlier than that of the Norton model in numerical simulation, and Norton model is more efficient than the composite time hardening model under the condition of ensuring accuracy.