In order to further understand the effects of Quercus acutissima age on soil aggregates and their organic carbon contents and explore the relationship between aggregate stabilities and carbon contents in aggregates of different sizes, artificial Quercus acutissima forests of 17, 26 and 65 a were selected to investigate water-stable aggregate composition, aggregate water stability, and changes and correlations of organic carbon contents in different size aggregates in 0-40 cm depth. The results showed that forest age had a significant effect on the composition and water stability of soil aggregates, and the effect increased with the increase of forest age but decreased with the increase of soil depth; Forest age also had a significant effect on organic carbon contents in soil aggregates, and the effect increased with the increase of forest age; Organic carbon content in <0.25 mm aggregates had an important effect on soil organic carbon contents in aggregates in different sizes, and is the main factor affecting water stability of soil aggregates.