本文介绍一种用激光散射测量燃料喷雾的颗粒尺寸分布的方法。该方法所依据的是小颗粒散射光的衍射近似原理。通过用曲线拟合和Ｓｐｌｉｎｅ光滑程序对实验测得的光信息进行予处理，从而一定程度上克服了 Ｓｈｉｆｒｉｎ—Ｆｙｍａｔ方法的某些缺点。数据处理结果与对二维样品的显微计数结果相比，颗粒尺寸分布的平均误差不超过 １０％， ＳＭＤ误差不大于２％，并具有较好的测量重复性。数据处理方法也具有简单、直观、数据处理速度较高等优点。 This article describes a method for measuring the particle size distribution of a fuel spray by laser light scattering. The method is based on the diffraction approximation of small particle scattering light. Some of the shortcomings of the Shifrin-Fymat method were overcome to a certain extent by preprocessing the experimentally measured light information using curve fitting and Spline smoothing. The data processing results show that the average error of the particle size distribution is less than 10% and the SMD error is no more than 2%, and the measurement repeatability is better than that of the two-dimensional sample. Data processing method also has the advantages of simple, intuitive, high data processing speed.