坐标系是解析几何的基础,有了坐标系,我们就可以把几何图形用代数的形式表示出来,为运用代数方法研究几何问题铺平了道路.而极坐标系是确定平面内点的位置的又一途径.新课标指出通过本专题的学习,旨在使学生从实际问题中抽象出数学问题,体会数学在实际应用中的价值,培养探究数学问题的兴趣和能力,增强应用意识. Coordinate system is the basis of analytic geometry, with the coordinate system, we can algebraic form of geometric representation, paving the way for the use of algebraic methods to study the geometric problems .Polar coordinate system is to determine the position of the plane point Another lesson is that the new curriculum standard pointed out that learning through this topic aims to make students abstract the mathematical problems from practical problems, understand the value of mathematics in practical application, cultivate the interest and ability to explore mathematical problems, and enhance the sense of application.