Abstract: Due to the influence of welding technology and the environment, it is very difficult to avid pore defect in the process of pipeline welding, which is quiet important for the pore size control. Based on the finite element method, the ABAQUS software was used to establish the nonlinear finite element model of pipeline girth welds of X60 steel containing porosity defects. The influence of the pore size, its location along the radial direction of the pipe wall and the weld reinforcement on the girth weld stress was discussed. The results show that the stress around the pore defect varies significantly and the peak stress position is different under different load conditions. Under the conditions of pipeline designed pressure and extreme compressive load, the peak stress is located at the pore edge in the axial direction. Under extreme tensile load, the peak stress is transferred to the pore edge in the radial direction. With the increase of pore diameter, the maximum equivalent stress of girth weld increases obviously. The closer the pore is to the inner and outer surfaces of the pipe wall, the bigger the maximum equivalent stress of girth weld is.