Abstract: Based on the principles of structured program design and normalized database design, a database system for the design of extrusion dies was developed. The system includes six design modules for six types of dies (dies for bars, dies for solid shapes, hollow section dies, dies for wall panels, spreading dies, dies with flow guid) and one system maintenance module, is not only the main sources of expert experience and design criteria, but also the supporting layer for the self-learning and self-accumulating in expert system for the design of extrusion dies. As an independent software, the system can accumulate experience and data related to die design, act as design standards manual and accomplish the calculations of certain design parameter and strength conditions of extrusion dies. The system is useful for decreasing designers' workload, improving the accuracy and rationality of die design.