与立体几何交汇的一类轨迹问题以空间直线与平面的位置关系为依托,研究平面解析几何中一类点的轨迹.解答这类问题的关键是把空间问题转化为平面问题,一般可从两个方面考虑:一是利用曲线的定义,二是用解析法求出轨迹方程.下面笔者从全国高考试题和有关省市高考模拟试题中精选出? A type of trajectory problem that meets with three-dimensional geometry relies on the positional relationship between space lines and planes to study the trajectory of a class of points in plane analytical geometry. The key to solving such problems is to convert space problems into planar problems, which can generally be from two. The following aspects are considered: First, the definition of the curve is used, and secondly, the trajectory equation is obtained by the analytical method. The following author selected from the national examination questions and relevant provincial and municipal college entrance examination simulation questions?