Severe soil erosion occurs in 70% of the Loess Plateau, China. In this study, the fractal geometry of micro-aggregates were determined to compare fractal dimensions of the soils and physical
and chemical characteristics of the soils in different restoration stages in the Loess Plateau. The results show that fractal dimension of upper layer soil micro-aggregates decrease with increased restoration time. The fractal dimension (D) of soils at 0～20cm changed from 2.360 ± 0.008 to 2.494 ± 0.015 with different restoration stage, while D changed from 2.441 ± 0.009 to 2.488 ± 0.016 at 20～40 cm and from 2.478 ± 0.028 to 2.492 ± 0.027 at 40～60cm. D was significantly different (p<0.01) for particles < 0.001 mm at 0～20cm. . D increased with increasing sand content But decreased with increasing clay content. D was positively correlated with bulk density, non-capillary porosity, porosity
ratio, total phosphorus, available potassium and ammonia nitrogen but negatively correlated with capillary porosity, soil organic matter and total nitrogen.