As an approach to explore the endangerment of Nyssa yunnanensis,a plant species with extremely small populations, two wind fallen trees were used to establish the correlations between N. yunnanensis growth and major climate factors on data of wood analysis and meteorological data in 1979-2009. The annual growth rate of radial,height and tree-ring width of N. yunnanensis showed a gradual downward trend,but the annual volume growth increased. The meteorological data showed that annual mean temperature was rising,while annual rainfall and annual mean relative humidity were decreasing in the habitat of N. yunnanensis from 1979 to 2009. The radial growth,height growth and tree-ring width of N. yunnanensis is negatively correlated with the annual mean temperature and positively correlated with annual rainfall and annual mean relative humidity,while annual mean volume growth is positively correlated with the temperature and negatively correlated with annual rainfall and relative humidity.