OBJECTIVE： To study the chemical constituents in Styrax tonkinensis. METHODS： The chemical constituents in S. tonkinensis was separated and purified by silica gel， medium pressure RP-18， Sephadex LH-20， semi-preparative HPLC， and the compound structure was analyzed and identified based on the physicochemical properties and spectral data. RESULTS： 6 compounds were separated from B.Styracis， namely Bis （2-ethylhexyl）phthalate （1）， 1-O-methy-guaiacylglycerol （2）， Threo-5-hydroxy-3， 7-dimethoxyphenylpropane-8， 9-diol （3）， Benzoic acid （4）， Vanillic acid （5） and Vanillin （6）. CONCLUSIONS： Compound 1， 2 and 3 are isolated from S. tonkinensis for the first time， and the study has laid a certain foundation for its quality evaluation.