解析法就是应用坐标系这一工具处理问题的方法。坐标系的建立,在形和数之间确定一种对应关系,从而为使用代数方法解决几何问题奠定基础,对于很多较为复杂的平面几何问题,若能认真分析问题的几何特征,巧妙利用图形的几何特征建立恰当的直角坐标系处理,常可大大降低题目求解的难度,而且整个过程更加简洁、明了,本文以四个平面几何有名定理为例加以说明。 Analytical method is to use the coordinate system of this tool to solve the problem. Coordinate system to establish a corresponding relationship between the shape and number, so as to lay the foundation for the use of algebraic methods to solve the geometric problems, for many more complex plane geometry problems, if careful analysis of the geometric features of the problem, the clever use of graphics Geometry to establish the right rectangular coordinate system processing, often can greatly reduce the difficulty of solving the problem, but the whole process is more concise and clear, the paper four well-known geometry theorem as an example to illustrate.