In the Torreya grandis National Forest Park in Zhuji, Zhejiang, Torreya grandis with five age groups (0-50, 50-100, 100-300, 300-500 and over 500 years) were selected for this study. Soil samples were collected in the field to analyze the total soil organic carbon (TOC), readily oxidizable carbon (ROC), light fraction organic matter (LFOM), and soil nutrient contents in 0-20, 20-40, and 40-60 cm soil layers. The changes of soil organic carbon for different treeage T. grandis were studied in this paper, which provided theoretical basis for the evaluation and sustainable use of the soil quality in forest stands, and the conservation of the old T. grandis. The results showed that, (1) the TOC, ROC and LFOM increased firstly and then decreased with the increase of the tree age, among which the content was the highest for the 300-500 years group. However, significant differences among tree ages were not found in the ROC and LFOM. (2) The ratio of ROC to TOC for different treeage T. grandis was: 50-100>0-50>100-300>300-500>500 years (except 0-20 cm soil layer). (3) The correlations between ROC, LFOM, and TOC in all age groups are extremely significant. The correlations between TOC, various active organic carbon component, total nitrogen, available nitrogen and available phosphorus were relatively strong at different ages (except for 0-50 years). The correlation between TOC, various active organic carbon component, available kalium, exchangeable calcium, and exchangeable magnesium were relatively weak (except for over 500 years). The correlations of TOC, active organic carbon component, and soil nutrients over 500 years were extremely significant.