Abstract: Sunflower seed oils extracted from the seeds of seven sunflower varieties by ultrasound method and accelerated oxidation of oils was studied by Schaal oven experiment in this study.Effect of accelerated storage on the variation of peroxide, acid and iodine value and contents of conjugated dienes and conjugated trienes produced by oxidation were compared to filter out sunflower seed with high antioxidant activity.The results revealed that the peroxide, acid value during the accelerated storage and the content of oxidized conjugated dienes and conjugated trienes after oxidation in Gankui 2 seed oil were significantly lower than the others ( p < 0.05) .And the variation of the iodine value in Gankui 2 seed oil was no significant different among LD5609 and Keyang 7, but markedly higher than other three varieties, which indicated that the antioxidant activity of the Gankui 2 species was the best among the seven.