波的叠加和穿越是学习波的干涉的必备基础知识 ,学生刚接触波时头脑中存在着很多错误观念 ,对波的叠加和穿越更是难以想象 ,更难以留下深刻的印象 ,因而有必要用清晰的实验现象消除其原有认知结构中的前概念 ,建立新的认知 .下面介绍两种演示波的叠加和穿越现象的方法 .方法一 Wave superposition and crossing are necessary basic knowledge for learning wave interference. When students touch the wave, there are many wrong ideas in the brain. It is hard to imagine the wave superposition and crossing, and it is difficult to leave a deep impression. It is necessary to use clear experimental phenomena to eliminate the former concepts in the original cognitive structure and establish new cognitions. Here are two methods to demonstrate the phenomenon of superposition and crossing of the demonstration wave. Method One