FSJ process of 7022 aluminum alloy was simulated by the finite element method. The residual stress and deformation laws were obtained by the simulation. The simulation results were verified correctly by the experiments. The simulation shows that the residual stress is mainly concentrated in the jointing region. The maximum tensile stress is located in the middle of jointing region. The residual compressive stress is located in the ends and other parts of jointing region. The deformation in the advancing side in the direction of vertical the jointing region is greater than that in the retreating side. The tilting in the key eye side is higher than that in the staring side. The whole deformation is such as the saddle shape.