Neohesperidin, naringin, and hesperidin contents of nine species of premature Korean citrus fruits have been determined. Flavonoids were extracted from dried citrus fruits by N,N-dimethylformamide and analyzed using RP-HPLC. 'Dangyooja' and 'Jikak' had higher content of neohesperidin and naringin. The content of hesperidin was higher in 'Binkyool' and 'Dongjeongkyool' than other seven species of citrus fruits, respectively.