《立体几何》是培养学生空间想象能力的重要学科,由点、线、面构成的题目错综复杂,在命题与证题时应有严密的逻辑性,即使对某些特殊情况也不能疏忽大意。否则会造成命题不真,或证题不全面甚至发生错误。本文对现行高中课本《立体几何》(甲种本)(下面简称“课本”)中的一些题目,在命题和证题时因忽视特殊情形所造成的错误进行一些分析和讨论。 “Three-Dimensional Geometry” is an important discipline for cultivating students’ spatial imagination ability. The topics composed of points, lines, and faces are intricate and complex. There must be strict logic in the propositions and questions, and even in some special cases, they cannot be negligence. Otherwise it will cause false propositions, or incomplete or even wrong proofs. This article analyzes and discusses some of the problems in current high school textbooks “Three-Dimensional Geometry” (A type of textbook) (hereinafter referred to as “textbooks”) that are caused by ignoring special situations in propositions and questions.