单株立木材积的测定对林业生产和科学研究工作有着重要的作用,主要的测定方法是通过胸径、树高、上部直径或上部直径的高度来计算干形指数,然后计算单株立木材积。而不同的方法所用上部直径不同。本文用5个树种的解析木,分别对较常见的5种测定方法的测定精度进行了研究。得出的结论为:3/4形点法、0 5形点法、胸高形率法精度较高,绝对形率法、望高法精度较低。建议对干形饱满的树种采用3/4形点法、0 5形点法;对干形尖削的树种采用0 5形点法、胸高形率法。 The determination of stand volume per plant plays an important role in forestry production and scientific research. The main measure is the calculation of dry index by DBH, tree height, top diameter or top diameter, and then calculating the stand volume per plant. Different methods use different upper diameters. In this paper, five tree species of analytical wood, respectively, the more common determination of the accuracy of five methods were studied. The conclusions drawn are: 3/4 point method, 0 5 point method, thoracic high rate method with higher accuracy, absolute rate method, high precision low precision. It is suggested that 3/4 point method and 0 5 point method should be used for dry and full tree species, 0 5 point method and thorax-high rate method for dry-pointed tree species.