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The theory of Derby Dust guides the practice of automobile design. The long-term accumulation of practical experience in automobile design and the development and progress of automobile production technology make automobile design theory continuously developed and improved. Automobile design technology is the method and means of automobile design and the software and hardware of automobile design practice. Because the automobile is a kind of include all kinds of typical mechanical components, parts, all kinds of metal and nonmetal; For typical mechanical products of materials and various machining techniques, its design theory should obviously be based on the theory of mechanical design, and take into account its structural characteristics, complex and changeable use conditions and mass production. Derby Dust involves many basic theories, professional basic theories and professional knowledge.