对１６株采自福建莆田的木麻黄株内不同高度、圆周不同方位木材密度及其径向变异和力学性质的测定与分析，结果表明：木材基本密度、抗弯强度、抗弯弹性模量、冲击韧性在株内不同高度上差异极端显著，顺纹抗压强度差异显著；在圆周不同方位上，４项力学性质和基本密度均为南北向高于东西向，冲击韧性、抗弯强度、抗弯弹性模量在圆周不同方位上差异显著，基本密度和顺纹抗压强度未表现显著差异．株内不同高度对木材密度和力学性质的影响大于圆周不同方位．在株内不同高度径向上，木材密度自外到内均逐渐减小，变化趋势大致相同 The results showed that the basic density, flexural strength, modulus of flexural elasticity, modulus of elasticity of wood, Impact toughness at different height within the plant is extremely significant difference between the parallel grain compressive strength significant differences in the circumferential azimuth, the four mechanical properties and the basic density are higher than the east-west north-south, impact toughness, flexural strength, resistance Bending elastic modulus in different directions around the significant differences, the basic density and compressive strength of the grain did not show significant differences. The different height of the plant on the density and mechanical properties of wood is greater than the circumference of different azimuths. At different height and radial in the plant, the density of wood gradually decreased from outside to inside, and the change tended to be the same