Determination was implemented on vertical density of 6-yearFraxinus chinensis wood at different part by vertical density analyzer. Analysis was made on relationship between vertical density and dynamic mechanical properties. The results showed that the vertical density closed to bark was the lowest, and increased gradually to the pith, but that closed to the pith was lower. The average vertical density was 409.0 kg/m3at lower part, 313.3 kg/m3at central part, and 304.1 kg/m3 at upper part. Correlation analysis demonstrated that vertical density at different part had significant relation with storage modulus, loss modulus, loss factor of other parts, except vertical density at upper part.%以6年生白蜡树（Fraxinus chinensis）杆材为试材，利用剖面密度仪测试其不同高度的剖面密度，并分析白蜡树杆材不同高度剖面密度与动态力学性能的关系。结果表明：白蜡树杆材近树皮的木材密度最低、由树皮到近髓心部位的木材密度逐渐升高、髓心处的木材密度又较低；下部的密度平均值为409.0 kg/m3、中部的密度平均值为313.3 kg/m3、上部的密度平均值为304.1 kg/m3；下部心材密度值较集中，而中部和上部心材密度值波动性较大；除白蜡树杆材上部剖面密度与储能模量不显著相关外，白蜡树杆材其他部位的剖面密度与储能模量、损耗模量和损耗因子等动态力学性能极显著相关。
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