Objective To analyse the essential oils constituents from Cortex ailanthi.Methods The essential oils in Cortex ailanthi were extracted with steam distillation,and its constituents were analysed with GC-MS.Results 22 compounds were identified and was 99% of the total peak area,in which,the Phthalic acid mono-(2-ethylhexyl) ester was 87%.Conclusion This study provides a scientific bas...