在测树工作中 ,现有的立木求积公式多数带有形数 ,由于形数未知 ,或需查表求得 ,不便于计算 ,在外业工作时尤其如此。还有些公式存在着部分计算因子不便实测 ,如中央断面求积公式、望高法求积公式中的中央直径和望高等 ,这些公式在实际应用中 ,一般效率较低 ,具有一定的局限性? In the work of tree survey, most of existing trinomial quadrature formulas have a form number, which is inconvenient to calculate due to the unknown number of shapes or the need to look up the table, especially when working in the field. Some formulas have some calculation factors inconvenient to measure, such as the central cross-sectional quadrature formula, look-high method of quadrature in the central diameter and look high, these formulas in practical applications, the general efficiency is low, has some limitations?