近年高考数学试题注重在知识网络的交汇处设计命题,出现了一系列设计精巧、内涵丰富、形式新颖的试题．以空间图形为依托的轨迹问题就是其中一个亮点,此类问题将平面几何、立体几何、解析几何、空间向量有机地融合为一体,令人耳目一新,拍手叫好．求解此类问题要求认真观察图形性质、善于利用空间图 In recent years, the mathematics test questions for college entrance examinations have focused on designing propositions at the intersection of knowledge networks. A series of questions with exquisite design, rich connotations and novel forms have emerged. The trajectory problem based on spatial graphics is one of the highlights. This type of problem integrates planar geometry, solid geometry, analytic geometry, and space vector into one, which is refreshing and applauding. Solving such problems requires careful observation of the nature of the graph and its ability to use the space map