Abstract: In order to obtain the optimum condition of plant extraction techniques,this paper studies the extraction techniques from A rctium lappa、Giycine max(L)Merrill、Allium sativum . The radio of raw material to water、extraction temperature and time were selected as three factors to design the orthogonal experament and the optimum condition of extraction techniques was obtained .The result showed that extraction temperature was the main factor .The optimum condition for the A rctium lappa extraction tecnique was as following :radio of raw material to water is 1:20,extraction temperature is 70℃,extraction time is 1 hour ; The optimum condition for the Giycine max(L)Merrill extraction tecnique was as following :radio of raw material to water is 1:10,extraction temperature is 70℃,extraction time is 1.5 hour ; The optimum condition for the Allium sativum extraction technique was as following :radio of raw material to water is 1:20,extraction temperature is 90℃,extraction time is 2 hour.