Seasonal dynamics of correlation coefficients on two pairs quantitative morphological traits – meristic (sternopleural bristles number and arista branches number) and morphometric (wing length and femora of third pair legs length) in a natural population of Drosophila melanogaster were researched. Three classes strains which distinguished by correlation level in pair of meristic traits N, P, and St were divided. Those classes have significance negative, positive correlation and absence relation, respectively. Seasonal dynamics of the ratio of those phenotypic classes were negligence. In pair of morphometric traits only two classes P and St were extracted, which characterized by significance positive relation and absence by it, respectively. Seasonal dynamics of ration strains in these classes have a statistic significance lead to continual decreasing number of P-strains and to increasing number of Ststrains on spring to autumn.