Abstract: 50 intraspecific hybridization Populus tomentosa clones including 49 offspring clones and one male parent clone in one year-old as materials, tree height(H), basal diameter(BD) and 10 leaf traits(leaf length(LL), leaf width(LW), leaf petiole(LP) et al.) were investigated. There were exist highly significant difference(P<0.01) for all the traits among different clone. The average of H, BD, LL, LF and leaf area(LA) were 64.47 cm, 7.53 mm, 9.43 cm, 8.78 cm and 60.05 cm², respectively. Coefficients of phenotypic variation(PCV) of all the traits ranged from 2.88%(leaf basal angle, LBA) to 100.36%(leaf sharp angle, LSA), coefficients of genetic variation(GCV) were close to PCV and repeatabilities(R) ranged from 0. 851 to 0. 973. High PCV and R were beneficial for excellent clone selected. There was significant positive correlation among LL, LW, LA, H and BD(P<0.01). Regression analysis results showed that LW, LL and leaf sawtooth number(LSN) were the most important factors for influencing H and BD growth. By the comprehensive evaluation, with a selection rate of 10%, Ph 111, Ph 153, Ph 90, Ph14 and Ph 12 were selected as the excellent clones．Genetic gains from these five clones were 32.20% for tree height and 13.01% for basal diameter, respectively.

Key words: Populus tomentosa, growth, leaf traits, coefficients of variation, repeatability