Abstract: Sweet orange is the most widely cultivated citrus species in the world with very high nutritional values. In this study, 25 main varieties of orange in China were measured. The classification and contents of phenols in the peel, pulp, and juice of different kinds of orange (ordinary sweet orange, navel orange, and blood orange) were analyzed by ultra high performance liquid chromatography (UPLC). Besides, the relationship between bioactive compounds and varieties of oranges was discussed. The results showed that the contents of phenols were abundant and showed some differences in the peel, pulp, and juice of three basic types of orange. There were little differences in the types and contents of phenols in different types of orange, and also the changing patterns of phenols were the same. Moreover, Seike navel orange (Japan-81-1) had more abundant flavonoid content and Washington Sanguine had more abundant phenolic acids and therefore had high utilization value.
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