The technological property and the stamping technology of 24 pin bottom shell was analysed. Layout scheme, total structure of the mould and design of the key parts were introduced. To reach high precision ,some bending position were carried out in steps, formed gradually and finally sized. The bending process was explained with scheme in detail. Varied punches were designed for the die to get high working part strength and easily manufacturing.This mould structure is compact, working smoothly, operating conveniently and is of high production efficiency.