机械图样是工程界的技术语言，要使学生掌握这门语言关键要抓住两个方面，一是图形表达，二是尺寸标注。在教学过程中，讲授图形表达学生比较感兴趣，只要空间概念建立起来，接受起来就比较容易，这方面的研究也比较多。而对于尺寸标注，虽说是重点，但学生不感兴趣，教学效果 Mechanical drawing is a technical language engineering, to enable students to grasp the key to grasp the language of two aspects, one graphic expression, the second is the dimension. In the process of teaching, it is more interesting to teach graphic expression students that as long as the concept of space is established, it is easier to accept them. There are more studies in this respect. As for the dimension, although it is the focus, but students are not interested in teaching effectiveness