Abstract: T-type welded structure is widely used in the process of shipbuilding, which has a great impact on the accuracy of shipbuilding. The thermal elastoplastic numerical model of multi-layer and multi-pass welding of single-sided V-groove T-joint was developed by using ANSYS software. The welding temperature field and stress field of marine grade A steel plate with thickness of 8 mm were simulated. The results show that transverse shrinkage and angular deformation will occur in the T type angular weldment after multi-layer and multi-pass welding. The experimental results are in good agreement with the numerical simulation results, and the numerical simulation model is accurate and effective.