Abstract:The performance of composite film made of chitosan and Arctium lappa L.extraction with different mix ratio were tested.The Arctium lappa L.extractions were mainly used to modify the chitosan properties.The result showed that the surface of composite film became smooth and there were no split phase.Besides，with Arctium lappa L.extracts increased，tensile strength of composite membrane increased after the first decreases，and maximum was（51.76±1.02）MPa when the concentration was 0.10 g/mL；breaking elongation reduced after the first increases，when the concentration was 0.12 g/mL up to（48.06±2.11）%；transmittance of O2，CO2and water vapor through the first decrease in increasing，be the smallest when the concentration was 0.08 g/mL，re spectivelywas（0.11±0.02）（nl·m）/（h·m2·Pa），（0.38±0.04）（nl·m）/（h·m2·Pa），（5.01±0.03）（mg·m）/（h·m2·kPa）. The ratio of O2permeability coefficient and CO2permeability coefficient in composite film was far less than 1.0；contact Angle decreased；antibacterial rate and·OH clearance increases，and up to 100%，the concentration，respectively，was 0.10，0.08 g/mL，membrane increased 2.8，6.7 times than chitosan.The results of the study provided a useful reference of the composite use in production.