Objective At present, the seedless grape cultivars in Turpan city are single. Screening high-quality seedless grape cultivars suitable for planting in Turpan city can not only enrich the structure of grape planting cultivars in Turpan city, but also improve their economic benefits.

Methods 18 seedless grape cultivars were used as test objects to carry out phenological observation, flowering and fruiting characteristics investigation, fruit internal and external quality index determination and other related tests.

Results The results revealed that the growth phenology of 18 seedless grape cultivars in Turpan area ranged from 94 to 152 days. The highest fruit setting rate of 'Flame seedless' was 67.07%, and the lowest was 37.99% of 'Fantasy seedless'. The highest soluble solids content of 'Bixiang Seedless' was 28.29%, the highest titratable acid content of 'Wonderful seedless' was 0.47 g/L, the highest total sugar content of 'Black monukka' was 161.10 mg/g, and the highest vitamin C content of 'Yanxing Seedless' was 4.6 mg/kg. The principal component analysis method was further used to comprehensively evaluate the 16 indicators.

Conclusion The analysis results revealed that the high ranking of these four cultivars: 'Centianni seedless' 'Bixiang seedless' 'Crimson seedless', 'Flame Seedless' have the potential to be promoted in a large area in Turpan, and the remaining cultivars can be promoted as characteristic cultivars in a small area.