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根据杉木林木胸径生长规律和林分分化特征，确定了间伐起始期和间隔期。利用优势高与平均高、年龄关系建立了杉木立地指数模型。通过对胸径与冠幅关系的研究，得到了不同立地指数下的杉木基本经营密度Ｎ０及饱和密度Ｎｋ模型。根据立地指数等确定经营密度指标ｕ，得到间伐后保留密度计算模型，并藉以计算间伐强度。提出了利用计算器编程进行间伐设计的新方法，只要输入胸径、部分树高和林龄，各林分因子及间伐技术指标就可从计算器中读出。此法操作简单，准确快捷，科学合理，实现了林分因子计算与间伐设计自动化。
According to the DBH growth pattern and stand differentiation characteristics of Chinese fir plantation, the initial period and interval of thinning were determined. Using the advantages of high and average high, the age established a cedar site index model. Through the study of the relationship between DBH and crown width, the basic operating density (N0) and saturation density (Nk) model of Chinese fir under different site indexes were obtained. According to the site index and other indicators to determine the density of business indicators u, obtained after the thinning of the reserve density calculation model, and to calculate the thinning strength. A new method of thinning design using calculator programming was proposed. The input of DBH, part of tree height and age, individual stand factors and thinning technical indicators can be read out from the calculator. This method is simple, accurate and fast, scientific and reasonable, and realized the calculation of stand factor and thinning design automation.