The ethanol concentration for precipitation,extraction time,extraction times and extraction temperature were selected as four factors to design the orthogonal test and the optimum condition of extraction techniques was obtained.The results show the optimum condition for the extraction technique is as follows: ethanol concentration for precipitation is 85%,extraction time is 2.0 h,extraction times is 3 and extraction temperature is 80 ℃.The extraction ratio of polysaccharide from Glehnia littoralis is 2.4% a...