二面角及其平面角是立体儿何中一个重要概念,本文介绍它的几个综合应用,以帮助中学师生加深认识,开拓视野,进一步提高综合应用所学知识解决实际问题的能力. The dihedral angle and its plane angle are an important concept of the three-dimensional child. This article introduces several comprehensive applications of it to help teachers and students in the middle school deepen their understanding, broaden their horizons, and further improve their ability to apply comprehensive knowledge to solve practical problems.