The effects of bagging and non-bagging before harvest on pulp browning index， firmness， total sugar， soluble solid content （SSC）， titratable acid （TA）， vitamin C （VC）， total phenols， total flavonoids contents， polyphenol oxidase （PPO）， peroxidase （POD）， superoxide dismutase （SOD） and catalase （CAT） activities， and total antioxidant capacity of yellow-fleshed peaches were studied. The degree of decay and browning of the yellow-flesh peach fruits in the non-bagging group was lighter than that of the bagging group. When stored for 8 days， the decay rate reached 90% for the bagging group and 80% for the non-bagging group， respectively. The browning index reached 78.3% （bagging group） and 67.5% （non-bagging group）， respectively. The quality analysis showed that the non-bagging treatment before harvest can delay the reduction of yellow-fleshed peach fruit hardness， total sugar， SSC， TA， total phenols and total flavonoids. Antioxidant analysis showed that the non-bagging treatment before harvest can maintain the vitality of PPO， POD， SOD and CAT， and has a higher antioxidant capacity in the late storage period. Correlation analysis showed that the decay rate was significantly positively correlated with antioxidant content and antioxidant enzyme activity （P<0.05 or P<0.01）， but it was highly negatively correlated with nutrient components and total antioxidant activity， respectively. Antioxidants （VC， total phenols and total flavonoids） were significantly positively correlated with antioxidant enzyme activities（PPO， POD， and SOD） （P<0.05）. The hierarchical cluster analysis divided the 17 physiological and biochemical indexes into 2 categories. The cluster analysis results were consistent with the principal component analysis results， which could reflect the similarities and differences between the physiological and biochemical indexes of yellow-fleshed peach fruits. Therefore， based on the above research results， the storage quality of yellow-fleshed peach fruits without bagging treatment before harvest is better than that of yellow-fleshed peach fruits bagged before harvest.