初中物理教材中有一些内容较为简单的内容,长期以来,不少教师认为内容简单,学生一听就懂,对于考试不太重要,往往忽视这些章节的教学.本文以《噪声及其控制》为例,介绍如何围绕三维目标,精心设计课堂教学,突出学生主体性,改变传统教学定势的做法. For a long time, many teachers think that the content is simple, students understand it, is not important for examinations, and often neglects the teaching of these chapters. In this paper, the “noise and its control” is Example, describes how to focus on the three-dimensional goals, well-designed classroom teaching, highlighting the students’ subjectivity, change the practice of traditional teaching.