Abstract: 【Objective】 To provide a theoretical basis for the restoration and protection of soil resources, we explored the composition and influencing factors of soil aggregates in Fengyang Mountain Nature Reserve.【Method】 This study based on four forest types(broad-leaved mixed forest, coniferous and broad-leaved mixed forest, fir forest, bamboo forest)within the range of 1 300-1 400 m above sea level in Fengyang Mountain Nature Reserve of Zhejiang Province, we determined the content of soil water stability aggregates and physical and chemical properties in different soil layers, and analyzed the effects of soil physical and chemical properties on the composition and stability of soil aggregates. 【Result】 ① The content of soil water-stable macroaggregates(WSA)(≥0.25 mm)in four forest types was above 90%; WSA content, geometric mean diameter(GMD)and average mass diameter(MWD)in bamboo forest were lower than those in other forests, and the highest values were observed in fir forest. ② Along the non-metric multidimensional scale(NMDS)axis 1, the effects of fir forest, coniferous and broad-leaved mixed forest, and broad-leaved mixed forest on the soil aggregates of ≥2 mm were obviously significant, while the effect of bamboo forest on the soil aggregates of ≥0.053-0.106 mm was significant. ③ Soil density showed a negative correlation with soil fractal dimension and a significant positive correlation with MWD and GMD. Soil non-capillary porosity content showed significant negative correlations with soil MWD and GMD and with soil fractal dimension. 【Conclusion】 The effects of forest types on the particle size composition and stability of soil aggregates were more significant than those of the soil layers, and the effects of soil density and non-capillary porosity on the particle size composition and stability of soil aggregates were more significant than those of the soil total porosity, capillary porosity and total organic carbon content.