Objective: To investigate the chemical components of Styrax tonkinensis. Method: Chromatographic technologies were used for separation and purification

while physicochemical properties and spectral analysis were used for structure elucidation. Result: Eleven compounds were isolated and their structures were identified as 19α-hydroxy-3-oxo-olean-12-en-28-oic acid ( 1 )

6β-hydroxy-3-oxo-olean-12-en-28-oic acid ( 2 )

sumaresinolic acid ( 3 )

siaresinolic acid ( 4 )

oleanolic acid ( 5 )

4- -2-methoxyphenol ( 6 )

benzoic acid ( 7 )

vanillin ( 8 )

vanillic acid ( 9 )

coniferyl aldehyde ( 10 )

dehydrodivanillin ( 11 ). Conclusion: Except for compound 7

the other compounds were isolated from S. tonkinensis for the first time.