We aimed to elucidate the nutrient element content and soil nutrient supply capacity of two forest ecosystems-Form. Quercus pannosa and Form. Pinus squamata-in the Yaoshan Nature Reserve of Yunnan, by using four sample plots. The analysis of C, N, and P content; ecologic stoichiometry; and its correlation with "leaf-litter-soil" in the four sample plots revealed the following. (1) The content of C and N in the same component was significantly different, and the content of P was not significantly different. There were significant differences in the content of C and N among the components in the same sample plot, and it decreased in the following order leaf > litter > soil. The content of P decreased in the order leaf > soil > litter. (2) The C:P and N:P ratios of leaf, and the C:N ratio of litter and soil were not significantly different in the four sample plots, whereas, the other indicators were significantly different. The C:N, C:P, and N:P ratios of leaf, litter, and soil in the same land were significantly different, and decreased in the order litter > leaf > soil. (3) The leaf-soil C content and C:P ratio, and litter-leaf N:P ratio in the Form. Q. pannosa exhibited highly significant or significant correlation. There was highly significant or significant correlation between the litter-leaf C and N content, leaf-soil P content, and C:N and N:P ratios in the Form. P. squamata. (4) The lack of soil N is the main factor limiting plant growth. Phosphorus is mainly derived from soil mineral weathering, rather than the short-term biological cycle.