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对日×长杂种子代进行了杂种优势、超亲优势、显性度等分析，并用树高、胸径、基本密度、管胞长度、管胞宽度、管胞长宽比６个性状对参试家系进行了无约束指数选择，结果表明：落叶松杂种优势是明显的、可利用的，但优势的大小则因亲本组合而异；杂种优势的比例随着树龄的增加有所下降；杂种因生长较快，木材基本密度有下降趋势。综合指数选择结果表明，日１×长１等４个杂种在生长和材性方面表现良好，是有推广价值的杂交种。
The hybrids of Japanese × long hybrids were analyzed for their heterosis, super-pro-dominance and dominant degree. The results were compared with the six traits including tree height, DBH, basic density, tracheid length, tracheid width and tracheid length-width ratio The results showed that: the larch heterosis is obvious and available, but the dominant size varies with parents; the proportion of heterosis decreases with the increase of tree age; Faster, the basic wood density downward trend. The result of comprehensive index selection showed that 4 hybrids, such as day 1 × long 1, performed well in growth and materiality, which was a popularized hybrid.