现行高中及中师数学教材在排列组合的应用问题中,涉及将给定对象进行分组的问题,学生在解决这类问题时,常常分不清“有序”与“无序”,本又对这一问题进行分类讨论. The application of the current high school and middle school mathematics textbooks in the permutation and combination involves the grouping of given objects. When students solve such problems, they often cannot distinguish between “ordered” and “unordered”. This issue is classified and discussed.