A total of 30 white poplar hybrid clones were used to study the phenotypic variation of growth traits in terms of tree height (H), diameter at breast height (DBH) and volume (V) in the age of 2-4 years old. The joint ANOVA results showed that there were statistically significant differences in H, DBH and V between sites, clones and sites ⅹclones (P 0.01). That PCV, GCV, and R of different traits increased with tree growth indicated that the variation was increased with tree growth, but the variations were strong controlled by genetic factors. All the traits were showed significantly positive correlation coefficient (0.404 2-0.988 7), indicating that each trait was correlated closely. The adaptability analysis of poplar clones showed that BL 28, BL 103 and BL 49 were high stability, and performance steady in different sites, but BL 106 and BL 107 had low stability, which were special adaptability for peculiar environment. Based on the analysis, colligate evaluated BL 104, BL 106 and BL 107 were selected as excellent clones when the selection rate was 20% in different sites, showing that all the three clones were not only adapt to peculiar environment, but also perform excellent in different environment. The research is of great value for new cultivar selection in the future.