Abstract: To evaluate the population dynamics of Quercus variabilis in Nanjing Spirit Valley, this study established a static life table, depicted survival curves and function curves, and made predictions with a timesequence model, based on a field investigation of Q. variabilis population in a deciduous broadleaved forest plot. The results showed that (1) the population was in the stage of expending with dynamic indices (V_pi and V′_pi>0). The survival curve displayed an intermediate pattern between Deevey-I and Deevey-II types. Together with the results from age-class analysis and the patterns of secondary succession, it was suggested that the Q. variabilis population was in a transition between expending stage and stable stage. However, the timesequence model indicated that the period of the transition would be long. Additionally, the fluctuation of population structure showed that, driven by strong environmental filtering, the population resistance, life expectancy and population stability increased while death density decreased with time. (2) Through 70 years of secondary succession in this deciduous broadleaved forest, the population of Q. variabilis showed a fluctuation dynamic, which generally trended to be stable but with a decreasing trend in seedling and sapling frequency. Thus, in terms of forest management, promoting the growth of Q. variabilis seedlings and saplings and ensuring their survival rate can maintain the growth and stability of the Q. variabilis population for the sustainable development of the deciduous broadleaved forest in Nanjing Spirit Valley.