本文的目的是从力的角度分析波在弦线端点反射时产生半波损失的机制.半波损失是物理学中一个很重要的概念,虽然有成功的解释,但不易理解.本文虽仅仅涉及波在弦线端点反射时的半波损失,但从力的角度分析较直观,计算简单、易于理解. The purpose of this paper is to analyze the mechanism of the half-wave loss when the wave is reflected at the end of the chord line from the perspective of force. The half-wave loss is a very important concept in physics. Although there is a successful explanation, it is not easy to understand. This article only deals with The half-wave loss of the wave reflected at the end of the string, but the analysis from the force point of view is more intuitive, the calculation is simple and easy to understand.