Taking bamboo as a 2-phase composite consisting of vascular bundles and matrix, the distribution of vascular bundles and the relationship between the tensile mechanical performance of bamboo and volume ratio of vascular bundles were studied by the microscopic image analysis and tensile mechanical test. The results show that the area of single vascular bundle increases gradually from the outer to the inner and the change trend is gentle when closing the inner of bamboo. The volume ratio of vascular bundles which increases from the inner to the outer becomes higher as the height of bamboo increases. The linear relationship between the tensile mechanical performance of bamboo and volume ratio of vascular bundles is revealed. Thus, the theoretical foundation for controllability of mechanical performance of bamboo is laid.%将竹材视为由维管束与基体组成的两相复合材料.通过电子显微图像分析及宏观抗拉力学试验,研究竹材维管束分布及竹材抗拉力学性能与维管束体积比之间的关系.结果表明:单个维管束面积由竹青至竹黄逐渐变大,且距竹黄越近变化趋势愈平缓；维管束体积比随着竹高的增加而增大,沿竹黄向竹青方向也不断增加；竹材抗拉力学性能与维管束体积比之间呈线性递增关系,这为竹质工程材料力学性能的可控性提供了理论依据.
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