贵刊91年6期《运用功率表达式求速度间的关系》(以下简称《关系》)一文,提出了从能量角度求速度的关系这种十分新颖的方法,大受启迪。然而,作为矢量的速度的分解,不是在任何力学问题中都能加以避免的,速度的分解也是高中力学教学中必须使学生掌握好的一种技能。怎样才能解决学生对此的一些困惑?本文想就作为矢量的速度的分解本身的特点,谈一点看法. In your article 91, “Using Power Expressions to Determine the Relationship Between Speeds” (hereafter referred to as “relationships”), a very novel method of asking for speed from the perspective of energy is enlightened. However, the decomposition of the velocity of the vector can not be avoided in any mechanical problems. The decomposition of velocity is also a skill that must be mastered by students in the teaching of high school mechanics. How can we solve some of the student’s confusion about this? This article would like to talk about the characteristics of the speed of decomposition as a vector.