During 2008-2013 133 collection varieties of fiber flax of domestic and foreign selection were studied. According to the results of the research, high-quality fiber sources were identified: by breaking load – 16, by flexibility of fiber – 1, by length of handful – 25, by fiber number – 19. Special attention should be paid to the high fiber content varieties of fiber flax: Melina, Drakkar, Lorea and Lea from France; Victorious, Tomsky 10 (mut.) From Russia; Liana, Vesta from Belarus, Evelin, Merylin, Agatha from the Netherlands; Diane from Portugal; Jitka from the Czech Republic; Temida from Poland.