This study was carried out on four typical forest types in middle subtropical zone: Chinese fir, slash pine, bamboo and secondary forest, to study the effects of forest type on soil water-stable aggregates and soil organic carbon (SOC) distribution characteristics. The results showed that the forest type had significant effects on soil aggregate contents of >5mm and 2-5mm size groups, which followed the sequence of secondary forest> Chinese fir> bamboo> slash pine (p<0.05). At 0-30cm soil layers, R0.25 and MWD in secondary forest were significantly higher than that in other forest types. SOC content in the same layer of the same forest type increased with the decrease of aggregate size. SOC contents of the same size aggregate group at 0-10cm layer decreased following the sequence of secondary forest> Chinese fir> slash pine> bamboo. There was no significant difference between secondary forest and plantations in other soil layers.