To address the issues of cracks and the spring back of the medium carbon alloy steel parts, the annealing process was added to improve the formability of the parts. The forming cracks were eliminated, and the elongation was increased from 12% to 25%.The spring back amount was confirmed by analysis of the parts conformity and stress condition. After calculation, the spring back spot R25 mm was changed into R16.5 mm and the circular chord height was changed from 1.7 mm to 2.7 mm. The die surface was processed according to the digital analog set up by AUTO FROM to guarantee that the shape of the die working part is conformed to the drawings.