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freedom volume.This property gives the polymer some unique properties,such as flexibility,etc.,but also make the polymer more easily penetrate othersubstances.In this paper,plastic beer bottles mainly refers to PET barrier tooxygen and carbon dioxide gas barrier property,so we focus on understanding thegas in the polymer through the mechanism.Mobile gas permeability and small molecules in polymer films by means of simplemolecules in the polymer trackless Brownian movement is different,but refers tothe gas in the polymer,at a concentration gradient driven by the highconcentration of side process side to the low concentration of directionalmovement.In 1866,Graham made the penetration of gas in the polymer includedissolution and diffusion of the two processes will dissolve-diffusion theory,itis the mechanism model over the past few decades the most widely accepted.