Abstract:Chimonanthus salicifolicus Hu leaves extracts were prepared by methanol circumfluence extraction. Five fractions were obtained by extraction with different polar solvents including n-hexane, dichloromethane, ethyl acetate, n-butanol and water. Then fractions were detected by total polyphenol content, reducing power, scavenging DPPH free radical and antimicrobial activities. The results showed that all the fractions exhibited high content of total polyphenol, and ethyl acetate fraction had the highest phenolic compounds, with the content of (309.50±4.81) mg/g. The fractions had strong antioxidative capacities such as reducing power and DPPH free radical scavenging ability. The fractions of methanol, n-hexane, dichloromethane, ethyl acetate, n-butanol and water had certain scavenging ability on DPPH free radical with IC50 of 1.24, 1.11, 0.61, 0.48, 0.98 and 1.36 mg/mL, respectively. The fractions also had the inhibiting effects on E. coli, S.aureus, B.subtilis and P.aeruginosa. Dichloromethane fraction presented the best antimicrobial effect than other fractions. Its MIC against four common bacterial strains was 2 mg/mL. In conclusion, the fractions have good antioxidant and antimicrobial activities, and this research was profitable for the further study of the separation of active compounds from Chimonanthus salicifolicus Hu leaves.