Objective: To investigate the chemical constituents of Aurantii Fructus. Method: The chemical constituents were isolated by chromatography on silica gel

sephadex LH-20 and ODS columns. Their physicochemical properties and spectral data were used to elucidate the structures. Result: Nine compounds were isolated from the ethanol extract of Aurantii Fructus and their structures were identified as umbelliferone (1)

marmin (2)

6'

7'-dihydroxybergamottin (3)

bergaptol (4)

meranzin hydrate (5)

ferulic acid (6)

limonin (7)

daucosterolpalmitate (8)

and daucosterol (9). Conclusion: Compounds 3-4

6

and 8-9 were isolated from this plant for the first time.