反函数是高中数学中的一个重要内容 ,也是历年的高考数学试题和各地的模拟试题中的热点问题 .为加深同学们对反函数概念的理解 ,解决好这类问题 ,本文由反函数的概念给出反函数问题的几个引申性质 ,并举例分类解析 .1　反函数的性质1)定义域与值域 .若函数 f(x) 的定义域为A , Inverse function is an important content in high school mathematics, and it is also a hot issue in mathematics test questions and simulation test papers in various places. In order to deepen the students’ understanding of the concept of inverse function and solve this kind of problem, this paper is made up of the concept of inverse function. Several extended properties of the inverse function are given, and an example is given for class analysis. 1 Inverse function properties 1) Domain and value domain. If the domain of the function f(x) is A,