Abstract: The extraction technology of volatile oil of mint（Mentha canadensis Linnaeus） was optimized by steam distillation with the raw material of mint leaf produced in Huangshan, Anhui province. The effects of four extracting factors （solid-liquid ratio, distillation time, soaking time and ultrasonic time） were used. The results showed that the best extraction technology was the solid-liquid ratio 1∶11 （g∶mL）, distillation time 3.0 h, soaking time 2.0 h, and the ultrasonic time 30 min. Under the condition,the average extraction rate of volatile oil was 2.3%. The verification test also showed that the extraction process of volatile oil from mint was stable and reliable.

Key words: mint（Mentha canadensis Linnaeus）, volatile oil, steam-distillation method, extracting technology