Abstract: In order to provide basis for afforestation designs, business programming and determination of tending thinning intensity in the artificial forests of Populus euphratica, the Populus euphratica plantation in the upper riparian reaches of Tarim River was taken as the research object to study the relationship among tree height, basal diameter, crown diameter and breast diameter. The result showed that: regression equation of tree height and breast diameter in Populus euphratica, which was H=12.8737/[1 + e^{(1.4228- 0.1781D)}], the regression equation of basal diameter and breast diameter in Populus euphratica was D₀=1.2839D_1.3+0.1465, the regression equation of breast diameter and basal diameter was D_1.3=0.7516D₀+0.4071; meanwhile, the regression equation of crown diameter and breast diameter in Populus euphratica was CW= 0.1897D_1.3+0.6911. The stand mean diameter of the Populus euphratica plantation was placed by equation, and obtained by estimate the diameter of each diameter average crown. According to the formula of circle calculated nutritive area, the unit area to remove nutritive area, which was theoretical density of the Populus euphratica plantation.