Objective]To develop the non-destructive evaluation technique of modulus of elasticity (MOE)for re-alizing the genetic selection and evaluation of forest tree with the traits of fast growing and high quality based on a large population of test materials.[Method]The evaluation systems of MOE of standing tree were established by non-destructive evaluation technique,Pilodyn and acoustic velocity (AV),and conventional testing methods based on the open pollinated family of 22-year-old slash pine (Pinus elliottii).[Result]The Pilodyn value (Pr)and the basic density (ρ)showed a significant negative correlation (P <0.01).The measurement value of MOE (MOEB), determined by conventional methods,had a very significant linear correlation with the MOE value calculated by the formula MOE =ρV2 .The regression model was MOEB =2.013 3 +0.828 6 MOE (Coefficient of determination R2 =0.854 1).A significant positive correlation (P <0.001)was observed between MOE and MOEP,the relative value of MOE,(MOEP =PrV2 )(V means the value of AV),and the linear regression model was MOE =0.400 7 +0.231 1 MOEP(coefficient of determination R2 =0.734 0).The positive correlation between MOE and V was ex-tremely significant (P <0.001 )and the linear regression model between MOE and V was MOE = -5.121 8 +3.239 4 V (coefficient of determination R2 =0.921 9).[Conclusion]The modulus of elasticity calculated by MOE=ρV2 can represent the determination values of MOE.The MOEP can be used directly as the MOE value for each sample tree to participate in genetic analysis.It is feasible to compare only the V when evaluating the relative value of MOE of the sample trees in the same population.Therefore,these linear models are also useful for other tree spe-cies.%[目的]开发操作简便、破坏性小且结果可靠的弹性模量无损评估技术，为实现以大群体试验材料为基础的遗传选择和评估，培育速生优质林木良种奠定基础。[方法]以22年生湿地松自由授粉家系测定林为研究对象，采用力学阻力仪（Pilodyn）和应力波速（V）记录仪（AV）等活立木无损评估仪器和方法以及木材物理力学常规检测方法，建立活立木弹性模量评估技术体系。[结果]Pilodyn 测定值 Pr 与实测基本密度（ρ）间呈显著负相关（P ＜0．01）；弹性模量测定值 MOEB 与弹性模量（计算值）MOE（MOE ＝ρV2）之间呈极显著线性相关关系，其线性回归模型为 MOEB＝2．0133＋0．8286 MOE，决定系数 R2＝0．8541；利用ρ和 V 计算的弹性模量值 MOE 与利用 Pr 和 V 计算的弹性模量相对值 MOEP（MOEP ＝PrV2）间呈极显著正相关关系（P ＜0．001），回归模型为 MOE ＝0．4007＋0．2311 MOEP，决定系数 R2＝0．7340；弹性模量 MOE 与 V 值相关极显著（P ＜0．001），V 与 MOE 的回归方程为 MOE ＝－5．1218＋3．2394 V，决定系数 R2＝0．9219。[结论]在遗传选择时弹性模量（计算值）完全可以代表弹性模量测定值进行评估与选育；可直接利用 MOEP 作为各样木的弹性模量值参与遗传分析；同时建立了 MOE 与 V 值之间的回归方程，在比较同一测定群体弹性模量值相对大小时也可直接比较 V 值，大大减少了工作量。建立的模型对其它树种测定具有参考意义，但尚需检验。
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