有关空间距离的问题既是立体几何的重点问题,也是难点问题,在高考试题中更是经常出现.进行空间距离的计算,一般是将问题最终转化为求线段的长度.在解题过程中,要充分利用图形的特点和概念间的内在联系,做好各种距离间的相互转化,进而使问题得到解决. The problem of spatial distance is not only the key problem of the three-dimensional geometry, but also the difficult problem. It often appears in the high-test questions. The calculation of the spatial distance is generally to convert the problem into the length of the line segment. In the process of solving the problem, Make full use of the characteristics of the graph and the internal links between concepts, do a good job of transforming each other’s distances, and then solve the problem.