分段函数情境新颖,技巧性强,本文将近三年新课程高考中的分段函数及少数未涉及的典型问题做一分类解析,以利于学生明确目标和方向;并设计一、二例变式训练,以培养学生灵活运用知识的能力. The piecewise function is novel in situation and strong in skill. This article has made a classification analysis of the subsection function and a few typical problems not involved in the new college entrance examination in the recent three years, in order to help students clear goals and directions, and to design one or two variants. Training to develop students’ ability to use knowledge flexibly.