Abstract: In this study,LDPE/LLDPE(80:20,W/W) material and bentonite were respectively used as substrate and inorganic filler to improve the gas and vapor transmission rate of PE film. The results showed that as the amounts of bentonite increasing,the tensile strength and the elongation rate at break of the films reduce gradually. The mechanical of the films with bentonite(undealed with coupling agents) is lower than that of those films with dealed bentonite. As the amounts of bentonite(undealed with coupling agents) increasing,the gas permeation rate and vapor permeation of the films increase gradually. By testing the respiration rate,weight loss rate,sensory quality and good Pleurotus geesteranus rate,it was indicated that the film being added 10.0% bentonite undealed with coupling agents is the best for preservation of Pleurotus geesteranus. The respiration peak of Pleurotus geesteranus appears the latest,the peak value is the lowest at 332.9 ml/kg·h,the weight loss rate of Pleurotus geesteranus amounts to 3.8%,and good mushroom rate amounts to 50.3% within 7 days. The Pleurotus geesteranus under about 15 ℃ could be kept for 6 days,4 days longer than fresh-keeping period of control sample.

Key words: fresh-keeping film, modified atmosphere packaging, bentonite, Pleurotus geesteranus