Abstract:Abstract：In order to obtain new degradable antimicrobial packaging material，the films were prepared by incorporated different volume fraction Rabdosia rubescens extract into alginate solution，and then the physical properties of film thickness，transparency，water vapor permeability and mechanical prop were studied.The fresh-keeping effect of the film on shatang mandarin was investigated.The results showed that R.rubescens extract had significant effects on the transparency and water vapor permeability of the film，when its mass fraction was more than 0.5 %，it reduced the mechanical properties of the film.After coating with this film，preservation of shatang mandarin were measured by determining their sensory quality and quality index during the storage period.The results showed that the composite coating had better preservation effect，it could significantly decrease disease index and weight loss rate as well as decay fruit rate and delay the decrease of titratable acids，vitamin C，soluble sugar，and soluble solids content（P＜0.05）.