Abstract:A rose is a flowering plant with medical and nutritional values.It contains a variety of active substances and has beneficial health care properties.In this study，the rose polyphenols were extracted using deep eutectic solvent（DES）with ultrasonic-assisted technology from the double rose'Fenghua No.1'.The traditional ethanol extraction method was also applied to extract rose polyphenols in comparison.The optimal extraction conditions of rose polyphenols by DES method were as follows:choline chloride lactic acid（molar ratio 1∶2）with 30% water content was the best extraction agent，the solid-liquid ratio was1∶40（g/mL），ultrasonic time was10 min，ultrasonic power was 400 W，ultrasonic temperature was 50℃，and extractions were completed two times.Under these conditions，the amount of polyphenols extracted was（136.20±1.23）mg/g.Compared with the ethanol extraction method，the number of polyphenols extracted by DES was increased by 24%.Antioxidant test results showed that the total reducing power and DPPH free radical scavenging ability of the rose polyphenols were similar to VC.Furthermore，ABTS+free radical scavenging capacity was higher than that of VC.These results indicate that rose polyphenols have strong antioxidant activity in vitro.