The spinning process for Al-Mg-Sc alloy cylinder with the inner circumferential rib is simulated by
the means of FEM numerical simulation, the stress strain status of the raw material and influence of technological parameter on spinning are analyzed. The results show the material is extended in axial direction and compressed in radial direction,and the material in the inner surface is extended in axial direction. Deformation ratio and feed ratio can influence spinning process, deformation ratio ought to be small than 50% and feed ratio ought to be between 05 and 20 mm/ r.