Abstract:The aim of the study was to establish the quantitative method for Toona sinensis aroma components and explore its changes during processing.The organic solvent extraction and gas chromatography-mass spectrometry （GC-MS）was used to analysis the characteristic aroma components of Toona sinensis and the change rules of three characteristic aroma components at the hot air drying temperatures.Results showed that the order of the extraction effect of the four extractants was acetonitrile，ethyl acetate，ethanol and n-hexane，and the order of the purification effect of the three purification agents was pesticarb（PC），octadecysilyl（ODS）and primary secondary amine（PSA）.The best extraction agent for the pretreatment of Toona sinensis was acetonitrile，and the best purification agent was PC.The contents of 3，4-dimethylthiophene，inverse 2-hexenal and 2，5-dimethylthiophene decreased in general，but the trend and amplitude were not the same.The content of 3，4-dimethylthiophene decreased by 15.08 % during 4 h drying.The content of 2，5-dimethylthiophene varied greatly，reaching 89.75 %.It could be seen that there were precursors in Toona sinensis from the change trend of the three target substances.The thermal effect would promote the decomposition and transformation of these precursors to the target substances，but the extension of drying time would promote the continuous loss of the target materials.The sensory evaluation test showed that the sensory quality of Toona sinensis was better when the hot air drying temperature was 50℃and the hot air drying time was 2 h.