The spinning forming process of aluminum alloy cylindrical workpieces was simulated numerically by the Deform-3D software. Optimized processing parameters were presented including spinning temperature of 20 ℃ ,main axle rotating velocity of 400 r/min and 50% reduction of wall-thickness as well as feeding rate of 0.75 mm/r through simulation with varied parameters. Meanwhile,stress and strain distribution in workpieces deformed zone were simulated with the optimized parameters. The results show that maximum value of equivalent stress and equivalent strain can be observed in the contacted zone of blank with spinning wheel. Spinning force is mainly exhibited as exerted force at axial direction.