Abstract: 【Objective】 To investigate the effects of calcium sugar alcohol spray before harvest on the quality and volatile substances of apricot fruit in Kumaiti. 【Methods】 Using Kumaiti as the test material, the fruit quality at maturity was determined by spraying 800, 1,200, 1,600 times diluted calcium sugar alcohol calcium solution before harvest. At the same time, headspace solid phase microextractivity-gas chromatography-mass spectrometry was used to determine the volatile compounds of apricot fruit at maturity stage. 【Results】 The quality of apricot fruit was improved by applying sugar alcohol calcium before harvest, among which KMT-800 treatment was the most significant. The single fruit weight, fruit hardness, soluble solids, vitamin C content and titrable acid content were increased by 8.50%, 64.13%, 31.05%, 61.03% and 86.57% compared with CK. The total content of volatile substances in Kumaiti fruit treated with different concentrations of calcium sugar alcohol was significantly higher than CK. The content of volatile substances in fruits treated with KMT-800 was the highest, which was (220.89±26.88) μg/g, an increase of 48% compared with CK. The total content of volatile substances in fruits of KMT-1,200 treatment and KMT-1,600 treatment increased by 39% and 25%, respectively.A total of 59 key aroma substances were screened, the contents of terpenoids, heterocyclic compounds, alcohols, phenols and ketones were significantly different from those of CK treatment. 【Conclusion】 The results show that the treatment of KMT-800 sugar alcohol calcium has the best effect on improving the quality and volatile substances of apricot fruit.