构造反例是一种创造,它可以从反面帮助人们澄清认识,加深对概念的理解．立体几何比较抽象,学习时常有错误认识,因此学会构造反例,对学习立体几何就显得尤为必要了．下面通过实例来谈立体几何中构造反例的几种常用方法． Constructing counterexamples is a kind of creation. It can help people to clarify understanding and deepen the understanding of concepts from the negative side. The three-dimensional geometry is relatively abstract, learning often has wrong understanding, so learn to construct counterexamples, it is especially necessary to learn three-dimensional geometry. Here are some common methods for constructing counterexamples in solid geometry through examples.