Abstract: To establish a rapid non- destructive evaluation system of fresh satsuma mandarin juice qualities,a portable electronic nose PEN3 was used for the aroma analysis.In this study,Miyagawa Wase Satsuma mandarin were stored in 20 ℃ and 85% relative humidity.Ten fruits were picked randomly to make juice every 3 days,then determine their aroma by PEN3.Principal component analysis( PCA) and linear discrimination analysis( LDA) were used to discriminate freshness of the fruits. The results showed that the response values of electronic nose and soluble solid content,and ascorbic acid content were correlated. Meanwhile,it was indicated by loading analysis that sensors W1 S,W2S and W2 W played a central role in evaluating the freshness of Satsuma mandarin.The use of LDA was able to better discriminate mandarin oranges of different postharvest storages.Therefore,electronic nose can be used as a rapid and non- destructive testing method for quality evaluation of fresh satsuma mandarin juice.