Abstract: In order to solve the problems in‘sugar core’apples including late ‘sugar core’appearing, delayed marketing and intolerant storage, the ‘sugar core’apples in Aksu Red Flag Slope Orchard were employed as the test materials, and their regulation capacities on‘sugar core’and storage qualities were further investigated after spraying 100 mg/L gibberellic acid（GA3） for 10 days and 20 days and stored at（0±0.1） ℃ for 100 days. The results showed that the value of L*, firmness, soluble solids and titratable acid contents in‘sugar core’ apple during 100 d storage were gradually declined with the extension of storage time. Compared with control group, 100 mg/L GA3 treatment could significantly delay these descent rates, which would be beneficial to maintain the overall visual qualities and the integrity of ‘sugar cores’. Additionally, compared with spraying GA310 days before harvest, the malondialdehyde（MDA） content and relative conductivity of apples sprayed 20 days before harvest showed little changes, especially on the 100 th day of storage, when the MDA content and relative conductivity only increased to2.813 mmol/g and 49.1%, respectively, which effectively maintained the integrity of fruit cell membrane structure.Therefore, spraying 100 mg/L GA3 before harvest could bring forward the appearance of‘sugar core’and promote their accumulation, while spraying GA320 days before harvest could significantly delay the diffusion of watercore, maintain the postharvest physiology and quality of fruits preferably, and improve the storability of fruits.