Abstract: In this paper, the polyphenol contents, DPPH-scavenging ability and effects of inhibition of the peroxide value and thiobarbituric acid value of sunflower oils during storage were analyzed for sub-critical camellia oil, commercial refined camellia oil and pressed crude camellia oil. It was shown from the results that the polyphenol contents of of sub-critical camellia oil,commercial refined camellia oil and pressed crude camellia oil were 6.26mg/g, 1.70mg/g and 8.33mg/g, respectively. The DPPH radical scavenging IC50 of sub-critical camellia oil was 15.39g/L (equivalent to 0.02g/L of VE), which was approximate to pressed crude camellia oil, but significantly lower than the commercially available refined camellia oil (21.66g/L). There were much more polyphenols contained in both sub-critical camellia oil and pressed crude camellia oil. The sub-critical camellia oil had a better performance in inhibiting the peroxide value and thiobarbituric acid value of sunflower oils during storage than that of commercial refined camellia oil and pressed crude camellia oil. Sub-critical camellia oil had the capacity to keep the antioxidant activity of oil products. In the process of producing camellia oil, sub-critical fluid extraction was a superior technology.