A study was carried out in the central and southern zones of wine growing of Moldova Republic, during 2007-2009 to evaluate the influence of gibberellic acid (GA3) on the productivity of vines and quality of grapes. It was established that the treatment of inflorescence of the seedless Loose Perlette, Summer Muscat, Monukka, Thompson Seedless, Ruby Seedless and seed Cardinal, Black Magic (Codreanca), Muscat Hamburg, Italia table grape varieties by biological active substances - gibberelic acid (GA3) leads to increase in the sizes and weights of clusters and berries, productivity of vines and grape quality. Productivity of vines increases on 10,0-92,3%, depends on biological particularities of grape varieties, concentration of growth regulators and terms of their application. We have established that for seedless grape varieties optimal concentration of biological active substances in phases of postfertilisation (3-5days after flowering) is GA3-100 ppm, for seed grape varieties - GA3-50 ppm.