目的：设计一套计算机程序，用于计算和分析颗粒粒度分布。方法：在Windows界面下，采用Visual basic程序设计语言进行设计。结果：所得到的粒度分布计算和分析程序，可以安装在Windows平台下运行。程序具有计算平均粒径和颗粒分散程度，以及绘制累积粒度分布、对数正态分布和威布尔分布图形等功能。结论：程序界面直观，操作简单，计算准确、快速。

OBJECTIV: To design a program for calculating and analyzing particle size distribution. METHODS: The program was obtained by using Visual Basic language under Windows environment. RESULTS: With this program the average particle size and geometric standard deviation could be calculated, and particle size distribution diagrams, such as cumulative distribution, logarithm normal distribution and Weibul distribution diagrams could be easily drawn. CONCLUSION: The program is simple and reliable.