In order to preliminarily evaluate the early growth of Pinus koraiensis and select excellent families, taking 117 full-sib family seedlings obtained by controlled pollination in the Affinity Seed Garden of Wangqing Forestry Branch of Changbaishan Forest Industry Group as materials, we observed their growth for three consecutive years and conducted a comprehensive evaluation after establishing a progeny measurement forest in the Affinity Seed Garden in the 91st forest class, class 4. The differences in seedling height and ground diameter of the offspring of P. koraiensis full-sib family lines from 6 to 8 years old were highly significant among family lines, and the interaction between family lines and district groups was highly significant (P<0.01); the average seedling height at 6 years old was 39.79 cm, the average annual growth rate at 8 years old was 25%, the average ground diameter at 6 years old was 11.11 mm, the average annual growth rate at 8 years old was 34%, and the phenotypic coefficient of variation of each trait ranged from 15.84% to 25.43%. The heritability of each trait was high, which was conducive to the further selection and evaluation of the family line. Using the Breggin multiple trait analysis method to select superior family lines, 24 superior family lines were from 117 familes with a benchmark of 20%. The excellent family lines selected by growth traits can provide the basis and materials for renewing the seed orchard generation and promoting the superiority and expansion of P. koraiensis.
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