摘要：通过对斯托克斯沉降原理的分析与推导，对应用该原理测定颗粒粒径应注意的几个问题进行了分析探讨，提出了该原理可测的颗粒最大粒径和最小粒径的计算公式，对实际应用有一定的指导意义。

关键词：粒径测定;斯托克斯沉降原理;流体力学;布朗运动;

Abstract；Based on analysis and deduction to Stoke's falling principle, some questions of par-ticle size measurement in Stoke's falling principle were probed and analyzed.The calculation formsof maximum measured particle diameter and minimum measured particle diameter in the principlewere put forward.It will attach importance to pratical application.

Key words：particle size measurement;Stoke's falling principle; fluid mechanics; Brownianmovement