组合体的形成是画组合体三视图以至于读组合体三视图的基础,是工程图学理论部分的核心、训练空间想象能力的关键以及工程图学理论的难点。在借鉴传统书籍中给出的组合体形成方式的基础上,通过分析不同特征的形体,找出它们各自相对最简单的形成方式,并在实践的基础上加以整理综合,进而提出一种根据特征信息判断组合体形成方式的新思路。 The formation of the combination is the foundation of the three view of the combination of compositions and the three views of the combination. It is the core of engineering theory, the key to training the imagination of space and the difficulties of engineering drawing theory. On the basis of drawing the way of the formation of the combination given in the traditional books, by analyzing the shapes of the different features, we can find out their relatively simplest formation ways and then put them together on the basis of practice. Then, Information to determine the formation of the combination of new ideas.