Due to the continuous development of new technology, 3D software has gradually replaced 2D software in various fields. In this course, we analyze the development and technical characteristics of Zhongwang 3D, CAXA and other software, briefly describe the difference between 2D CAD technology and 3D CAD technology, the background of 3D CAD technology, the necessity of developing from 2D CAD technology to 3D CAD technology, and introduce relevant terms in the process of software application, So as to help students understand the advantages and characteristics of three-dimensional software independently developed in China.