Abstract:Polysaccharide was extracted from Changbai mountain ginseng stems and leaves by water extraction and alcohol precipitation.The content of polysaccharide was determined by phenol-sulfuric acid method，and the extraction rate was as an index.The extraction technology was optimized by the single factor experiment and the orthogonal test design.The extraction temperature，extraction time，material-to-water ratio and pH of 4 factors on extraction rate of polysaccharide were evaluated.Ultimately the optimal extraction condition was as follows：extraction temperature 90 ℃，extraction time 4 h，material-to-water ratio 1 ∶25（g/mL），pH 5.0.In thess conditions，the extraction rate of polysaccharide in ginseng stems and leaves was 5.64%.