现今中职学校的制图教学中,由于教具的局限以及多媒体无法普及,很大程度上制约了制图教学的效果,加之学生空间思维能力不足,单纯靠老师讲解,大多数学生根本画不出完整的三视图,即使画出轴测图,学生也很难把图想清楚,因此,教师可以引入计算机辅助教学CAD来弥补制图教学中的空白。同时,随着科学技术的迅猛发展和计算机的广泛应用,在实际生产中对制图的要求 Due to the limitations of teaching aids and the inaccessibility of multimedia, the teaching of graphics in secondary vocational schools today restricts the effectiveness of cartographic teaching to a large extent. In addition, students’ ability to think in the space is inadequate and teachers simply do not explain them. Most students simply can not draw complete Three views, even if the axon is drawn, it is difficult for students to figure clearly, so that teachers can introduce computer-aided teaching CAD to make up for gaps in cartography teaching. At the same time, with the rapid development of science and technology and the widespread use of computers, the requirements of cartography in actual production