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The application discloses a KASP molecular marker related to quality traits of Brassica napus and application thereof, and belongs to the technical field of molecular genetics.The application discloses the KASP molecular marker related to quality traits of Brassica napus and a primer thereof, and application of the KASP molecular marker and the primer in genotyping or quality trait identification of Brassica napus.The results show that the application can accurately identify genotypes, has high sensitivity and specificity, and effectively reduces the error rate.The application further discloses a Brassica napus genotyping / quality identification method.The results show that a material with a genotyping result of AA has the characteristics of low erucic acid, low glucosinolate, high oleic acid, high linoleic acid, low arachidic acid and low protein content; a material with a GG type shows high erucic acid, high glucosinolate, low oleic acid, low linoleic acid, high arachidic acid and high protein content.The application can quickly screen out individuals with excellent quality traits in early generations, and avoids the long process of identifying traits after plants mature in traditional breeding.