Abstract: In order to study the growth regularity of natural Castanopsis fargesii and estimate the development of it. Based on the Castanopsis fargesii’s analytic material in Yanping, Fujian, through the stem analysis method and the fitting of the equation, the author studied the law about how Castanopsis fargesii’s diameter at breast height, tree height, volume change with age. The results showed that: the natural Castanopsis fargesii diameter at breast height, tree height, volume total increment increased with age growing in natural circumstances in Yanping, Fujian, the best growth model of natural Castanopsis fargesii diameter at breast height, tree height of was quadratic curve model, the best growth model of volume was Richards and Korf. When tree growth was 12, the speed of growth was faster. The juvenile seedling grew quickly, in order to improve the growth of Castanopsis fargesii, people should pay attention to its watering and fertilizer management especially, when cultivating in order to improve the increment of Castanopsis fargesii.