三角函数是高中数学课程的核心内容之一。从发展的视角来看,三角函数是用代数方法研究几何问题的基本工具,高等数学把它们描述成无穷数列的极限和微分方程的解,并将其定义扩展到复数系。我们要进行科学而合理的教学设计,就必须从知识、方法和思想等方面认识三角函数内容的结构体系。要根据三角函数知识内容的课程目标进行核心知识结构的解构,要努力帮助学生构建适当的知识网络,认识 Trigonometry is one of the core contents of high school mathematics curriculum. From a developmental point of view, trigonometric functions are the basic tools for the study of geometrical problems using algebraic methods. Higher mathematics describes them as solutions to the limit and differential equations of an infinite series, and extends their definition to complex systems. If we want to make a scientific and reasonable instructional design, we must understand the structural system of trigonometric functions from the aspects of knowledge, method and thought. It is necessary to deconstruct the core knowledge structure according to the curricular goals of trigonometric function knowledge content, and efforts should be made to help students build an appropriate knowledge network and recognize