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对７４株１０年生泡桐主干与树冠生长相关关系进行了调查，并利用回归分析方法建立了主干与树冠生长的数学模型．经实例分析检验表明，培养 １０年生主干高 ６．０ ｍ，胸径３０．６２ｃｍ的泡桐树需要８．１６ ｍ和７．６０ ｍ的冠幅和冠高，泡桐的合理干冠比值为０．７９．该模型切合生产实际，为泡桐高干定向培育提供了理论依据．
The relationship between the trunk of canopy of 74 10-year-old paulownia and canopy growth was investigated, and the mathematical model of trunk and canopy growth was established by regression analysis. The case study shows that the highest crown height and crown height of 8.16 m and 7.60 m are needed for the cultivation of paulownia trees with a height of 6.0 m and a diameter of 30.62 cm. The reasonable dry-crown ratio of paulownia is 0.79 . The model meets the actual production and provides a theoretical basis for directional cultivation of Paulownia.