Abstract:Rosa roxburghii Tratt was extracted with different solvents including water，methanol，60% ethanol，anhydrous ethanol，n-butanol，and ethyl acetate.The content of vitamin C（VC），total polyphenols，total flavonoids，tannins，and total triterpenoids in the extracts was determined.The antioxidant activity antioxidant potency composite（APC）in vitro was evaluated for different extracts.The results showed that the content of total polyphenols，total flavonoids，tannins，and total triterpenoids was the highest in the 60% ethanol extract and that of VC in the water extract.The content of total flavonoids，VC，and total triterpenoids was the lowest in ethyl acetate extract and that of tannins in n-butanol extract.The 60% ethanol extract showed the strongest DPPH and ABTS radical scavenging activities and reducing power.The methanol extract and ethyl acetate extract showed the strongest hydroxyl and superoxide anion radical scavenging activities，respectively.According to APC，the antioxidant activity was in a descending order of 60% ethanol extract > methanol extract > water extract >anhydrous ethanol extract>ethyl acetate extract>n-butanol extract.Because of the synergistic or antagonistic effects between different active components and the varied solubility of different active components in different solvents，different solvents have great impacts on the active component content and antioxidant activity of R.roxburghii extract.