Abstract: Along with the popularization and rapid development of computer software and hardware technology and the growing demand of manufacturing for 2D and 3D design techniques of computer graphics, it is particularly important to blend 2D and 3D design techniques of computer graphics in the teaching of the engineering graphics. The paper introduces the teaching reform and practice of the three-dimensional CAD in Beijing Institute of Technology. Three modes are introduced as the outside hanging mode, the segmentation mode and the fusion mode. The focus is on how to syncretize the three dimensional CAD and engineering graphics effectively.

Key words: engineering graphics, 3D, teaching reform, Inventor