Abstract: A Cunninghamia lanceolata plantation in Hongya forest farm was selected as an object to research the growth process of dominant trees under density control by the stem analysis method. The results showed that density control could affect the growth process of tree height, DBH and wood volume of dominant trees. The high density of stand would reduce the maximum of the average growth and the annual growth of tree height. It also made the tree height maturity earlier. The low density of stand would increase the average growth of DBH, and made the DBH maturity later. The high density of stand could reduce the total growth and the average growth of volume. It also postponed the time of the maximum of the average volume growth and the annual volume growth, and made the volume maturity later. Low density(500 plants·hm^-2) was conducive to cultivating large diameter wood of C. lanceolata, while medium and high density (>500 plants·hm^-2) was proper for cultivating medium or small wood.