用数理统计方法研究了七座电厂18组灰样颗粒特征参数间的相关性。它们是:标准稠度、需水量比、比表面积、80μm筛余量、45μm筛余量、细度模数和细度比。通过研究发现,需水量比和80μm筛余量、细度模数、细度比之间存在一定相关关系。文章提出粉煤灰颗粒形态系数这个新概念。形态系数在一定程度上说明了粉煤灰的颗粒形态。导入形态系数后,粉煤灰颗粒的某些特征参数间的相关系数大为提高。形态系数可作为评价粉煤灰品质的一个重要参数。 The correlation between the characteristic parameters of the grey particles in the 18 sets of seven power plants was studied using mathematical statistics. They are: standard consistency, water demand ratio, specific surface area, 80 μm sieve balance, 45 μm sieve balance, fineness modulus and fineness ratio. Through the study, it was found that there was a certain correlation between the water requirement ratio and the 80 μm sieve residue, fineness modulus and fineness ratio. The article proposes a new concept of fly ash particle form factor. The form factor explains the particle morphology of fly ash to some extent. After introducing the form factor, the correlation coefficient between some characteristic parameters of fly ash particles is greatly improved. The form factor can be used as an important parameter to evaluate the quality of fly ash.