In the conditions of the South Urals, an economic and biological assessment of 9 plum varieties introduced from the Altai Mountains (the village of Chemal) was carried out in order to assess and identify the best ones for breeding and practical use. According to the research results, accessions with a complex of economically valuable traits were identified. Accessions G 7-126 (26.1 kg per tree) and G 9-150 (23.2 kg per tree) were the most productive in the years of research. Freezing of generative buds in the winter of 2017/2018 was observed in the accessions G 9-150, G 7-126 and amounted to 0.5 points (not more than 10 % of the buds), in the remaining variety specimens from 2.5 to 3.0 points ( buds death was 25-50 %), which led to yield reduction. Late fruit ripening period (second decade of September) was noted for the accessions G 7-126 and G 9-150, the remaining the accessions (77.8 %) have a medium late ripening period. The accession G 9-150 was distinguished for good winter hardiness, weakness, productivity, late ripening, quality and taste of fruits. Three accessions are recommended for breeding — G 12-132, G 12-150 (winter hardiness, weakness, fruit quality), G 7-126 (accession with anthocyanin color of the pulp of the fruit).