通过分析激光粒度仪的系数矩阵的计算公式．指出不同焦距下的各个系数矩阵之间存在着简单的比例关系，即可由一个焦距对应的系数矩阵推得另一个焦距的系数矩阵，从而可减少仪器测量所需的系数矩阵数目。这一关系式已由数值计算及对标准颗粒的实测得到证实。 Through the analysis of laser particle sizer coefficient matrix calculation formula. It is pointed out that there is a simple proportional relationship between the various coefficient matrices under different focal lengths. That is, the coefficient matrix of another focal length can be deduced from a coefficient matrix corresponding to the focal length so as to reduce the number of coefficient matrices required for the instrument measurement. This relationship has been verified by numerical calculations and the measurement of standard particles.