矢量的方向性特征很容易在教学实践中被忽视,甚至在矢量的表述中也常会有学生不能完整地体会其表意功能,而造成此种尴尬的根本缘由是教师对矢量的表意功能缺乏应有的教学关注.本文截取教学实践中的片段而作理性剖析,意在引发应有的关注. The directional characteristics of vectors are easily overlooked in teaching practice. Even in vector representations, students often fail to fully understand their ideographic functions. The fundamental reason for such flaws is the lack of ideographic functions of teachers for vectors. The teaching is concerned. This article intercepts the fragments in the teaching practice and makes a rational analysis, which is intended to cause due attention.