立体几何解答题,用传统方法解答,需要做大量的定性说明论证,使用空间向量坐标运算,避开了空间立体几何中的平行、垂直、角、距离等问题的定量分析,只需建立空间直角坐标系,运用平面法向量进行定量运算,使问题得到了大大的简化．而用向量坐标运算的关键是建立一个适当的空间直角坐标系和正确解出法向量． The problem of solving a three-dimensional geometric solution using traditional methods requires a lot of qualitative explanations. Using space vector coordinate calculations, it avoids the quantitative analysis of parallel, vertical, angle, and distance problems in spatial three-dimensional geometry. It only needs to establish a right angle in space. The coordinate system, which uses the plane normal vector for quantitative calculations, greatly simplifies the problem. The key to using vector coordinates is to establish an appropriate spatial Cartesian coordinate system and correctly solve the normal vector.