In this paper, the process of teaching engineering graphics as object of analysis is discussed that how to use 3D digital model and replace the actual model of green design concepts to carry out practical activities to make the teaching process drawing more lively, interesting manifestation of designing.By selecting projection direction and cutting the position of the view, without changing the structure of the case, to determine the size of their own, can better engage students in the graphics design capabilities and adapt to the current undergraduate teaching university requirements for engineering drawing by student recognition. This teaching model will progress with a variety of science technology and expand the teaching contents Engineering Graphics.