[Objective]To study the effects of exogenous SA on postharvest physiology and storage quality of blueberry fruits. [Method]The cold-resistance in Yunnan chengjiang area 'reveille' blueberries as experiment material, with concentrations were 0. 5 tendency, the tendency for 1. 0 L and 1. 5 L tendency for the salicylic acid solution/L processing, measure its sensory quality, fruit hardness, soluble protein and malondialdehyde (MDA), total phenol and antioxidant enzyme activity, discuss the postharvest physiology and storage quality. [Result] 0. 5 mmol/L exogenous salicylic acid treatment could significantly reduce the fruit rot rate, maintain the fruit hardness, improve the activity of superoxide dismutase (SOD) and peroxidase (POD), and slow down the increase of malondialdehyde (MDA) content. [ Conclusion] 0. 5 mmol/L exogenous salicylic acid treatment can delay fruit senescence, significantly inhibit the physiological metabolism of blueberry fruit after harvest, and effectively maintain the low temperature storage quality. Principal component analysis was performed on 8 physiological indexes of blueberry fruits treated with exogenous SA at different concentrations. The physiological indexes with eight values greater than 1 were synthesized into 2 factors, and the cumulative variance contribution rate reached 90. 563 %. The first principal component mainly represented MDA information, while the second principal component mainly represented POD and SOD information. The results of correlation analysis showed that there was a significant positive correlation between fruit hardness and sensory quality score (P < 0. 01). POD and SOD had no significant correlation with sensory quality score and fruit hardness. There was a significant positive correlation between total phenol and sensory quality score,fruit hardness, POD and SOD (P < 0. 01). There was a significant positive correlation between ASA and sensory quality score and fruit hardness (P < 0. 01) . The soluble protein was positively correlated with POD and SOD (P < 0. 01). MDA was significantly negatively correlated with sensory quality score, fruit hardness, total phenols and ASA (P < 0. 01), indicating that the postharvest quality of blueberries treated with exogenous SA was closely related to the integrity of fruit cells and antioxidant capacity. The comprehensive score of principal components showed that the comprehensive score of postharvest blueberry fruits was the highest when treated with 0. 5 mmoVL exogenous SA. [ABSTRACT FROM AUTHOR]