The volatile oil in the leaves of Michelia alba DC.was extracted by two different methods,including ultrasonically assisted extraction and microwave-assisted hydrodistillatin.With the yield rate of volatile oil as the index,the optimum extracting technology and the optimum conditions of extraction for volatile oil from the leaves of Michelia alba DC.were determined by orthogonal experimental design.The results suggested that the optimum extracting technology was microwave-assisted hydrodistillatin and the o...