Abstract:  Object:To study and optimize the extracting technology conditions of the volatile oil of lavender.Method:Taking volume of volatile oil as index,the orthogonal test method was used for studying the effects of three extracting factors(the shape of the medicinal herbs,the distillating time,and the ultrasonic time)and three different levels of each factor on the volatile oil’s yield of lavender.Result:The optimum conditions of the oil of lavender are:powder of 40-mesh,and distillating time 2h.Conclusion:The process is feasible and useful for new drug study on lavender,with average extracting rate of the volatile oil as(2.78±0.02)×10-2 。

Key words: lavender, volatile oil, orthogonal test, extracting technology