Based on the data from the sampling plots of Larix principis-rupprechtii plantations of the forestry farms of Ningdong Forestry Bureau in Shaanxi Province,this paper studied on the regression models of DBH and the crown area ( Cws),and used this to calculate the theoretical density and optimal management density. The results showed that; 1) the optimal regression model of DBH-Cws was Cws =0. 044 6D2 - 0. 755 1D+6. 753 3. 2) the table of theoretical density and optimal management density were established under a series of canopy densities between 0. 7 - 0. 9 of L. principis-rupprechtii plantations. 3) the canopy density of 0. 7 was the optimal management density.%利用在宁东林业局进行的华北落叶松人工林标准地调查资料,研究了落叶松胸径与树冠面积的相关关系；并在此基础上,利用胸径、树冠面积和立木密度的相关规律,推算林分不同径阶的理论密度和适宜经营密度.结果表明:1)宁东林业局华北落叶松人工林胸径与树冠面积关系的最佳回归模型为Cws=0.044 6D2-0.755 1D+6.753 3;2)编制出理论密度和郁闭度为0.7～0.9的适宜经营密度表；3)落叶松人工林郁闭度为0.7时的林分密度为最适经营密度.
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