借助分形几何理论，探讨红土在不同处理方法下其颗粒粒度的分维变化特征结果表明：红土的颗粒粒度具有线性分形结构的特点是客观存在的事实，其分维值的大小反映了土中颗粒粒度的分布情况，并与土的物理力学性之间存在一定的关系分维是描述土的颗粒粒度的一个新的特征参数 The fractal geometry theory is used to investigate the fractal dimension variation characteristics of laterite with different treatment methods. The results show that the particle size of laterite has the characteristic of linear fractal structure, which is an objective fact. Particle size distribution, and the physical and mechanical properties of soil there is a certain relationship between fractal dimension is to describe the soil particle size of a new feature parameters 