In this paper, the quantitative dynamics of main dominant populations of Di-nghushan forests are analysed. The population growth curve of Cryptocarya chinensis and Cryptocarya concinna conforms with the logistic curve,but the population growth curve of Castanopsis chinensis is approximate to a parabolic curve, The equations of population growth (6) , (7), (8), (9), (12), are fitted and established for Cryptocarya chinensis,Cryptocarya concinna and Castanopsis chinensis. They have a considerable confidency.