Abstract: To investigate the effects of different thickness packaging on the postharvest quality of honey peaches, a study was conducted using ‘Baixue’ honey peaches as the experimental material. The honey peaches were packaged in polyethylene fresh-keeping bags of three different thicknesses: 0.040 mm, 0.055 mm, and 0.080 mm, without polyethylene fresh-keeping bags packaging as the control group (CK) and all samples were stored at (4±1 ℃), this study investigated the impact of polyethylene fresh-keeping bags of varying thicknesses on the quality indices, gas content within the fresh-keeping bags, and related enzyme activities of honey peaches. The results indicated that, compared to the control group, the packaging of polyethylene fresh-keeping bags of varying thicknesses effectively prolonged the quality of honey peaches. When the honey peaches were packaged in a 0.080 mm thickness fresh-keeping bag and stored for 42 days, the fruit retention rate reached 100%. This result was significantly better than that of the CK group and the 0.040 mm treatment group (P<0.05), but not significantly different from the 0.055 mm treatment group (P>0.05). The weight loss rate was only 0.44%, and the soluble solids content was 10.27%, both of which were significantly lower than those of the CK group (P<0.05). However, these values were not significantly different from those of the 0.040 mm and 0.055 mm treatment groups (P>0.05). The firmness of the fruit decreased by 30.42% compared to the initial firmness, which was significantly better than that of the CK group, 0.040 mm and 0.055 mm treatment groups (P<0.05). The O₂ and CO₂ concentrations in the fresh-keeping bags were 1.10% and 10%, respectively, and were significantly different from those in the 0.040 mm and 0.055 mm treatment groups (P<0.05). The honey peaches exhibited color parameters of L^*=69.21, a^*=9.95, b^*=15.4 and the titratable acidity was measured at 1.4%. These values were significantly different from those of the CK group and the 0.040 mm and 0.055 mm treatment groups (P<0.05). The polyphenol oxidase activity was 24.12% lower than that of the control group, which was significantly better than the CK group and the 0.055 mm treatment group (P<0.05). However, it was not significantly different from the 0.040 mm treatment group (P>0.05). In conclusion, the 0.080 mm polyethylene fresh-keeping bags significantly extended the storage period of honey peaches, thereby providing a theoretical foundation for honey peach preservation technologies.