从影响林木生长的环境因子入手，采用数学方法，找出了影响各引种栽培区内１－６９／５５杨生长的主导气象因子和主导土壤因子。在此基础上，采用数量化方法编制了Ｉ－６９／５５杨立地指数得分表。根据大量的固定标准地和临时标准地资料，经综合分析，提出了１－６９／５５杨的适宜造林密度和各项丰产栽培技术措施。 Starting from the environmental factors that affect the growth of trees, mathematical methods were used to find out the dominant meteorological factors and the dominant soil factors that affect the growth of 1-69 / 55 poplars in each introduced cultivation area. On this basis, a numerical method was used to compile the I-69/55 Yang Ge Index Score Table. According to a large number of fixed standard and temporary standard data, the suitable planting density of 1-69 / 55 poplar and various high-yield cultivation techniques and measures were put forward through comprehensive analysis.