Abstract:Polyethylene terephthalate（PET）is a thermoplastic polyester material.The PET bottle is a commonly used packaging form for dairy products.Mixing functional resin materials in PET raw materials and thus changing the barrier properties of the packaging can provide strong protection for milk storage.In this study，the ability of three kinds of PET bottles（common PET transparent bottle，PET transparent bottle with 2% reactive oxygen，and PET non-transparent bottle with 8%-12% light-blocking resin）to avoid light oxidation of pasteurized milk was compared.The conditions of display in retail stores and supermarkets were simulated，and the samples were stored for 31 days.The changes of dissolved oxygen，riboflavin，and flavor compound composition during the storage period were detected，and the light-blocking and oxygen-blocking characteristics of packaging materials were determined；correlation analysis was conducted through sensory tests.The results showed that an appropriate light barrier could avoid the oxidation of pasteurized milk due to light during longterm storage and prevent the abnormal flavor.2% oxygen barrier did not provide significant protection.The riboflavin and oxygen content of pasteurized milk in common PET transparent bottles and PET transparent bottles with 2% reactive oxygen decreased during the whole storage period，and the abnormal sensory flavor was significant.There was no significant difference in the PET bottles with light-blocking resin addition amount at 8%-12%.