由于抛物线方程中有一个坐标变量是一次的 ,因此在设抛物线上的点的坐标时 ,我们可直接设二次变量为参数 ,如抛物线 y2 =2 px(p 0 )上的点可设为 (y0 22 p,y0 ) .采用这一设法 ,给解决问题带来了一定的方便 ,且过程显得简捷明了 .下面以近几年高考图 1　例 1图题举例说明 .例 Since there is a coordinate variable in the parabolic equation once, we can set the secondary variable directly as the parameter when setting the coordinate of the point on the parabola. For example, the point on the parabola y2 =2 px(p 0 ) can be set as ( Y0 22 p,y0 ) .Using this approach, it brings certain convenience to the solution of the problem and the process is simple and clear. The following example illustrates the example of Example 1 of the college entrance examination in recent years.