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利用日本落叶松半同胞子代测定林的材料，以线性函数式、对数函数式及二次抛物线函数式拟合遗传力平方根比率和幼一成龄遗传相关系数随相对年龄变化的趋势，以年遗传增益作为评价指标，构建最大年遗传增益模型。根据轮伐年龄及估算的最佳早期选择年龄和早期选择效率，确定了日本落叶松逐步选择的早期选择策略。对于轮伐龄材积的选择，以树高作为早期选择指标较为适宜，若轮伐龄为２０ａ，可采取一次选择，分别在２年生及７～８年生时进行；若轮伐龄定为４０ａ，则采取３次选择，分别在３、１２和１５～１６年生时进行。
Based on the linear function, logarithmic function and quadratic parabola function, the square root ratio of heritability and the genetic correlation coefficient of one-year-old with the trend of relative age Year genetic gain as an evaluation index, to build the maximum annual genetic gain model. According to the rotation age and the estimated early selection age and early selection efficiency, the early selection strategy of Japanese larch selection is determined. For the selection of rotation age timber volume, it is more appropriate to use tree height as the early selection index. If the rotation age is 20 years, one selection can be made at 2 years old and 7-8 years old respectively. If the rotation age is 40 years, Then take three choices, respectively, at 3,12 and 15 to 16 years of age.