The phenotypic diversity of the flowers and leaves of three Rosa odorata var. gigantea populations containing 240 plants in Liangwang Mountains, Chengjiang City, Yunnan Province were analyzed by means of nested variance analysis, phenotypic variation coefficient analysis and Pearson correlation analysis. The results showed that there was abundant phenotypic diversity within and between populations, and the phenotypic differentiation coefficient ranged from -1.51% to 26.18%. In the close distance, the intrapopulation diversity was much higher than the interpopulation diversity. The mean coefficient of variation of phenotypic traits within populations was 13.62%, and the dispersion degree was relatively low. Among them, the largest differentiation coefficient was the length of peduncle, and the smallest was the ratio of petal lengthwidth. The correlation analysis showed that the correlation between most flowerrelated traits was strong and the same is true for most leafrelated traits, while the correlation between flowerrelated traits and leafrelated traits was low or even irrelevant.