通过杉木第一代改良种子园45个优良无性系调查结果表明：无性系间单株产量达到极显著水准，遗传方差份量占总变异的37．77％，可见杉木种子园产量很大程度上受到遗传性的制约．在参试的45个无性系中，高产无性系占20％，产量占总产的42．02％，单株产量构成的直接因素为单株果量和单果出籽量，间接效应为雌雄花量． The results of 45 elite clones through the first generation improved seed orchard showed that the single-crop yield reached a very significant level among clones, and the genetic variance accounted for 37.77% of the total variation, showing that the production of Chinese fir seed orchard was greatly affected Hereditary constraints. Among the 45 tested clones, the high-yielding clones accounted for 20% and the yield accounted for 42.02% of the total output. The direct factors of yield per plant were single fruit number and single fruit seed-seed yield. The indirect effects were male and female flowers the amount.