以2019年嘉峪关产区马瑟兰葡萄为研究对象，对不同采收期浆果的可溶性固形物、pH、百粒重、纵径、横径、果形指数、可溶性糖、可滴定酸、总酚、单宁、糖酸比、葡萄糖、果糖、蔗糖、苹果酸、酒石酸、柠檬、酸草酸等18项品质指标进行研究，结合主成分分析法对其品质进行综合评价。结果表明，可将马瑟兰葡萄的18项品质指标综合为3个主成分，其累计贡献率为96.01%，能够反应果实的大部分品质性状；确定2019年嘉峪关产区马瑟兰葡萄的可采收时间为9月5至17日，9月9日为最佳采收期。

In this experiment， the grapes of‘Marselan’ in the Jiayuguan production area in 2019 were selected as the research object. The grape fruits were picked from August 28 to September 17， and 18 quality indexes of berries at different harvest periods were analyzed as follows:soluble solids， PH， 100-grain weight， vertical diameter， horizontal diameter， fruit shape index， soluble sugar， titratable acid， total phenol， tannin， sugar to acid ratio， glucose， fructose， sucrose， malic acid， tartaric acid， lemon， acid oxalic acid. The quality was comprehensivelyevaluated by principal component analysis. The results showed that the 18 quality indexes of‘Marselan’ grape could be integrated into 3 principal components， withacumulative contribution rate of 96.01%， which could reflect most of the quality traits of fruit.The harvest time of‘Marselan’ grape in Jiayuguan producing area in 2019 is from September 5 to September 17， and September 9 isthe best harvest time.

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