Abstract: In order to meet the requirement of friction stir welding joint for 7050 aluminum alloy plate with 10 mm thickness, an arbitrary Lagrange-Olah model was established, which was combined with simulation analysis and experimental research, the distribution law of joint temperature field under rotating speed, welding speed and welding time was analyzed. The thermal cycle curves of the measured temperature and the characteristic points are in good agreement, indicating that the numerical simulation can be used to predict the distribution pattern of the temperature field. The results show that the temperature field distribution of the weld cross-section under different welding parameters are bowl-shaped. The peak temperature at each location point increases with increasing rotational speed and decreasing welding speed, where the rotational speed has a more significant effect on the peak temperature. Finally, the experimental verification of the mechanical properties of the joint under three groups of process parameters, found that 800 r/min, 1.6 mm/s group of parameters under the better tensile properties, the study method for the determination of large thickness of light alloy stir friction welding process provides a reference.