为了解激光粒度仪法和传统的筛析-沉降法在模型沙粒度测量方面的差异，用这两种方法对几种模型沙样品分别进行了粒度分析。结果表明，激光粒度仪法测试的结果偏粗，分选偏差；上述两种方法获得的平均粒径或分选系数之间均存在显著的线性相关性。激光粒度仪法测定的粗颗粒物质（小于 2.184 Φ）和细颗粒物质（大于 4 Φ）比筛析 - 沉降法偏多。对不同的粒级组分进行了激光法和筛析 - 沉降法的回归分析，粗颗粒物质相关性好，可以进行数据间的转换。

In this study, on the basis of the grain size analysis using the laser diffract instrument and sieve-pipette methods for several model sediments, the two sets of grain size parameters are compared and the differences between the two methods are analyzed. The results obtained with Mastersizer 2000 show somewhat greater mean size and lower sorting coefficient than those obtained by the sieve-pipette methods. However, the results acquired by the two methods have significant linear relationship between the mean size and sorting coefficient. In comparison with the sieve-pipette analysis, the percentages of the most coarse-grained and fine-grained materials are relatively larger by the laser analysis. The regression analysis in different grain sizes indicates that the coarse  grained materials have better relationship, so it could be utilized for the data conversion between these two methods.