Abstract: Aiming at the problems of poor alignment and easy welding leakage of oil at the welding process of traditional vibration damper cylinder, the outer cylinder of the front shock absorber of a new energy vehicle of Beijing Automobile Works was taken as the research object, and the design of the hot spinning program of the cylinder based on the principle of metal plastic forming was completed. A finite element model was established based on DEFORM platform, and the spin forming process of each pass was investigated through numerical simulation. Through single-factor simulation analysis, the effects of spinning temperature, spinning wheel feeding speed and spindle speed on the equivalent force, maximum radial spinning pressure and dimensional deviation of the workpiece were obtained. The multi-objective optimization of each spinning parameter in the spinning process was carried out by means of the Design-Expert software. The optimized spinning temperature is 1114 ℃, the feed rate is 6.2 mm/s, and the spindle speed is 583 r/min. The results show that the equivalent force is reduced by 6.3%, the maximum radial spinning force is reduced by 3.9%, and the dimensional deviation is reduced by 22.2%. The feasibility of the process solution is finally verified experimentally.