Abstract: Effect of ethanol extractions of Cinnamomum cassia on fresh- keeping of ‘Newhall'navel orange fruits were investigated during storage at( 6 ± 1) ℃.The results showed that Cinnamomum cassia extractions significantly reduced decay rate and weight loss rate in comparison with the controlled group( p < 0.05).At the same time,the extractions treatment could effectively maintain the quality and flavor of fruit,for it could significantly slow the decreasing of total soluble solids( TSS),titratable acid( TA) and Vitamin C( VC),decrease respiration intensity and MDA contents during the middle- later storage( 50 ~ 100 d). Cinnamomum cassia extractions treatment was remarkable in maintaining the activities of superoxide dismutase( SOD),peroxidase( POD) and polyphenol oxidase( PPO) and it could delay the activities degradation of above- mentioned antioxidant enzyme at the middle- later period.Cinnamomum cassia extractions can play a good role in the fresh- keeping of navel orange fruits and may be a potential natural preservative.