Abstract: In the second generation clonal Cunninghamia lanceolata seed orchard in Yuhang Changle Forest Farm, Zhejiang province, a total of 39 open-pollinated filial generations (including 2 controls) were selected for seedling cultivation and afforestation test in 1997. In 2009, sampling determinations were carried out on their DBH and wood basic density. Genex Protools 4.0 software was used to excavate the functional relationship between basic density and DBH. The results showed that there were significant differences among families in DBH and basic density. The heritability of family was greater than that of individual plant. The genetic coefficient of variation of DBH and basic density were 6.78% and 3.07%. DBH had extremely significant negative genetic correlation with basic density. Breeding values of parents and filial generation were estimated. 8 families with excellent DBH and 9 families with basic density were selected by reverse selection of breeding value. Eighteen breeding parents of the third generations were selected by forward selection.