The shape of car pillar parts is complex， and the length and the shaping resilience are great， which makes the development of stamping die more difficult. Firstly， the processing procedure of the parts is preliminarily determined through process analysis； secondly， the simplified process is verified by simulation technology， and the shaping process scheme is determined； thirdly， according to this scheme， a set of multi-step processing die for the reinforcing plate of car D-pillar outer plate composed of 4 sets of independent parting dies is designed； finally， the real impact test before production is carried out. The results show that the simulation results are qualified according to the simplified process of "drawing→trimming→shaping"； the multi-step processing die designed according to the process scheme of "drawing→trimming， trimming→transposition→trimming and punching" has produced parts with good appearance quality and qualified hole position and surface accuracy. It is concluded that the proposed design method is reasonable and feasible， and the designed die has good adaptability to the processing of car column parts.