Based on the sampling (0-10, 10-20, 20-30 and 30-40 cm) and lab analysis of two representative natural secondary oak forest plots in Liaodong mountain area, which was located in the town of Benxi City River Estuary and the fairy town of Zhuanghe City, the distribution characteristics of soil organic carbon, total nitrogen ,and total phosphorus at the depth of 0-40 cm was studied, and the relationship between organic carbon and other physical and chemical properties was discussed. Results showed that soil organic carbon, total nitrogen, total phosphorus, total potassium, available nitrogen, available phosphorus, available potassium and cation exchange capacity tended to decline with the increasing soil depth, however soil bulk density generally increased with increasing soil depth. According to the t test and variance analysis, there was a significant difference between the experiment indicators and the soil layer (P<0.05). Moreover, the content of silt showed a very high positive correlation with the soil organic carbon, pH value, total nitrogen, total phosphorus, total potassium, alkaline hydrolysis nitrogen, available phosphorus, available potassium and cation exchange capacity (r=0.430 9~0.919 0, n=44, P<0.01). While soil bulk density and the content of sand had a significant negative correlation with soil organic carbon (r=0.388 3~0.670 6, n=44, P<0.01). But the content of clay had no significant correlation with soil organic carbon. Stepwise regression analysis showed that the relationship between soil available nitrogen, the ratios of carbon to nitrogen, total potassium, pH, total nitrogen and organic carbon was the closest. Overall, there was close relationships between soil organic carbon and other physical and chemical properties, and the total nitrogen, available nitrogen, the ratios of carbon to nitrogen, total potassium and pH had big impact on it. At the same time, each index had obvious profiles distribution.