Abstract: Fruit quality diversity of forty accessions of mango germplasm，preserved in South Subtropical Crops Research Institute，Chinese Academy of Tropical Agricultural Sciences，China，were studied for three consecutive years. Variance，correlation and principal component analysis（PCA）were used to evaluate experimental results. Fruit physical parameters including shape，vertical diameter and cross section，weight，stone weight，pulp recovery，pulp fibrosis and fruit colour，chemical parameters including total soluble solids content，titratable acidity，reducing sugar and vitamin C and sensory parameters such as taste and aroma were investigated. A high variability was found among forty mango varieties. The ShannonWeinner index ranged from 0.94 to 1.60 indicated that striking differeces in the studied qualities traits. Principal component analysis（PCA）showed multi-directional variation of mango fruit quality traits. Less fluctuation of all fruit quality traits except for titratable acidity and reducing sugar was observed among different production years. Significant correlations was found among some mango quality attributes.

Key words: mango, fruit, quality, genetic diversity, germplasm, principal component analysis