根据Fraunhofer理论研制的激光衍射式粒庆分布测试仪具有在一个较宽的粒度分布范围内进行实时测量的优点。但是，分散粒子的浓度在很多仪器上无法显示出来。本文根据固定检测器的测量电压与衍射光强度之间的关系特性，研究了一种测量不同形状粒子（如：球形、方形及拟柱体）的? The laser diffraction particle analyzer based on the Fraunhofer theory has the advantage of real-time measurement over a wide range of particle size distributions. However, the concentration of dispersed particles can not be displayed on many instruments. According to the relationship between the measured voltage and the intensity of diffracted light of a fixed detector, this paper studies a method of measuring particles of different shapes (such as spherical, square and quasi-cylinder)