The present study was to investigate the effect of the disease resistance induced by 0.2 g/L benzo-thiadiazole-7-carbothioic acid S-methyl ester(BTH) treatment on the storage quality in postharvest peaches(Prunus persica(L.) Batsch cv.'OkuBa')at 20℃.The results of the experiment exhibited that the 0.2 g/L BTH treatment could effectively induced the reaction of systemic acquired resistance(SAR),increased the activities of defense-related enzymes including chitinase and β-1,3-glucanase,and increased total phenolics content.Therefore,the development of the blue mold disease by P.expansum was significantly controlled.Nevertheless,the SAR induced by BTH treatment also lower the ethylene peak value and the contents of glucose and sucrose,inhibited the accumulation of total flavonoids,anthocyanins and carotenoids during the storage,slowed down the negative symptoms of fruit ripening and secondary metabolites synthesis.Therefore,we speculate that the disease resistance reaction SAR induced by BTH is an irreversible energy and material consumption course for postharvest peach fruit and may influence the ripening quality of the fruit.