Fractal analysis and laser diffractometry were combined to characterize the fractal of soil particle size distribution (PSD) through Rényi dimension spectra in the multifractal system. The results indicated that the monofractal dimension of soil PSD in various land-uses ranged from 2.28 to 2.47 and had a significant linear regression with the content of soil clay. Dclay, Dsilt and Dsand were calculated and they were in an order of Dclay