For the problems of residual stress and deformation of welding structure,the numerical simulations of conventional welding and welding with trailing cooling are carried out to analyze the influence of the welding with trailing cooling method on the temperature field,stress field and deformation of T-joints. The results show that comparing with conventional welding,the application of welding with trailing cooling can forms the temperature trough at the welding cold source and reduces the range and time of high temperature action. The effect of welding with trailing cooling on residual stress is mainly concentrated in the area near the weld,which can reduce the maximum residual stress of the welding structure. The maximum welding deformation is 2.89 mm for conventional welding and 2.06 mm for welding with trailing cooling. Thus,the residual deformation can be reduced by the method of welding with trailing cooling.