With the leaves of Cuminum chrysantha as the research object,the essential oil extraction technology was studied by using essential oil extraction rate as index.Based on the single factor experiment,the ultrasonic extraction,va-por distillation and supercritical CO2 extraction were explored to extract essential oil from the Cuminumchrysantha leav-es.The process parameters and the influence of different factors on extract efficiency were all investigated and optimized to obtain the optimal extraction technology with high essential oil extraction rate.Results showed that the best essential oil e...