Abstract: In order to understand the ecological stoichiometry characteristics of C, N and P in different organs of Quercus wutaishansea Mary in Bailong River region, 16 sample plots of Q. wutaishansea Mary were set up by the typical sampling method, and the samples of roots, branches and leaves were collected to analyze the contents of C, N and P. The results showed that: (1) The content of C in each organ of Q. wutaishansea was leaves (517.36 g·kg⁻¹) > roots (411.39 g·kg⁻¹) > branches (392.87 g·kg⁻¹); for N content, the order was leaves (19.51 g·kg⁻¹) > branches (6.09 g·kg⁻¹) > roots (5.82 g·kg⁻¹); for P content, the order was leaves (1.75 g·kg⁻¹) > branches (1.03 g·kg⁻¹) > roots (0.61 g·kg⁻¹), and most of the three nutrients were distributed in the leaves. (2) The variation of C in each organ species was weak relative to N and P, and the maximum coefficient of variation was P content in the root. (3) The range of C∶N in each organ was 28.15 to 69.93, with the largest in root and the smallest in the leaf. C∶P ranged from 311.33 to 814.25, with the smallest in leaf and the largest in root. N∶P ranged from 6.41 to 12.07, with the smallest in branch and the largest in root. (4) C was positively correlated with N and N∶P, while C is negatively correlated with C∶N. N was significantly correlated with C, P, C∶N, C∶P and N∶P, and positively correlated with P and N∶P. P content was significantly correlated with N, C∶N and C∶P, and negatively correlated with C∶N and C∶P. C∶N was positively correlated with C∶P, negatively correlated with N∶P, and positively correlated with C∶P. Thus the content of nutrient elements in organs of Q. wutaishansea in this region was closely related to the functional structure of corresponding organs.