CAD(ComputerAidedDesign), that is, computer aided design, refers to the technology that uses computer software to make and simulate physical design to show the appearance, structure, color, texture and other characteristics of newly developed goods.

The earliest application of CAD was in automobile manufacturing, aerospace and electronic industry production of large companies, and it has been widely used in print publishing and other fields.

In manufacturing, it is often necessary to design new products. The steps of product design include concept introduction, geometric design, structural analysis and optimization, simulation and so on. Introducing the whole design process into engineering concept is a means of modern design technology. After applying CAD, the whole life cycle of the product can be designed comprehensively in the design stage.