This paper focuses on the characteristics of soil humus components and their changing tendency influenced by biological soil crusts in the rehabilitated grassland of the hilly loess region. The results showed that: 1) There was clear hierarchical characteristics of the distributions of humic acid, fulvic acid and humin content of the soil humus components influenced by biological soil crusts, all in the order of the crust layer＞0 ~ 2 cm layer＞2 ~ 5 cm layer. Humus contents of different years showed an overall order of 16a＞8a＞32a＞12a. Soil humus content changed non-linearly with the time. HA/FA changed in the average range of 0.34 ~ 0.70. Humic acid in the humus content was not high, influenced by biological soil crusts in this area. Fulvic acid is the main composition of soil humic acids. 2) In the crust layer, E4/E6 values of soil humic acids mainly performed as a “parabolic curve” type with the time, while in 0 ~ 2 cm and 2 ~ 5 cm layers, E4/E6 values of soil humic acids showed a slow increasing trend. 3) There was very significant linear correlations (p＜0.01) between soil humus components and soil nutrients, including total nitrogen, nitrate nitrogen, ammonium nitrogen and available zinc. 4) There was a very significant binomial function regression correlation between soil humus component content and total nitrogen content, nitrate nitrogen, ammonium nitrogen as well as available zinc. It showed the close relation among the influences on soil carbon, nitrogen or available zinc by biological soil crusts.