The structure of populations of an oak fluffy (Quercus pubescens uercus pubescens Wil) on a numbererer of attributes of the sizes of a trunk and a crone of trees in Republic Moldova is investigated. It is revealed, that within the limits of populations the height and diameter of trees can vary in average limits. At the same time it is shown, that the majority of a population differs authentically to investigate attributes. From higher told follows, that trees of an oak which form populations, possess hereditary potential of the polygenic control of various force of growth on height and diameter. This phenomenon justifies carrying out of actions on selection in limits the best the best the best populations of an oak that will allow to reveal individuals with semnificativ nificativ characteristics with characteristics with characteristics with a view of the further improvement of an oak fluffy. It is especially important in connection with that the modern structure of populations of an oak is submitted by undersized oak groves, with prevalence in them of the curved trees with low omitted crones.