研究79株日本落叶松Pildoyn测定值、木材基本密度与木材纤维特性间的关系。结果表明: Pilodyn测定值、木材密度、生长量南北方向上存在显著差异。Pilodyn测定值和相同方向上的木材密度存在极显著的负相关（-0.454～-0.587），Pilodyn测定值和晚材纤维特性存在极显著的负相关（-0.329～-0.447），而与早材纤维特性的相关关系不显著（-0.015～-0.137）。建立各个指标对Pilodyn测定值的通径图，并对该模型进行缩减，得到原模型85%信息的新模型。新模型中木材密度贡献率为46.71%，生长量贡献率为24.47%，晚材管胞长贡献率为28.82%。建立Pilodyn测定值和木材密度线性回归方程，南向方程决定系数（0.425 3）高于北向的决定系数（0.209），南向方程预估精度为98.05％，北向方程预估精度为97.80%，因此以上模型用来预测日本落叶松的木材基本密度是可行和可靠的。
This article studies the relationship among Pilodyn penetration, wood basic density and wood fiber property based on 79 Larix kaempferi in order to provide indirect estimate index of the wood property genetic improvement of Larix kaempferi. The result shows that there is remarkable difference among Pilodyn penetration, wood basic density and wood property on south and north directions. The Pilodyn penetration has significant negative correlation（-0.454--0.587）with the wood basic density in the same direction，the same with the late wood fiber property（-0.329--0.447）, but has common negative correlation with the early wood fiber property（-0.015--0.137）. We set up a path graphics between Pilodyn penetration and other wood indexes and get the new model which is retrenched from the old model and keeps 85% information. In the new model，the wood density contribution is 46.71%, the growth contribution is 24.47% and the rest is the late wood fiber length, 28.82%. We constitute linear regression equation of Pilodyn penetration and the wood density，the result shows that the coefficient of determination of south directions (0.425 3) is higher than north directions（0.209）and the estimation precision of linear regression equation in south is 98.05％, in north is 97.80％, which means that it is feasible and dependable to estimate the wood density of Larix kaempferi with the upper model.