Abstract: This article used the medicinal material Codonopsis pilosula which was rich in selenium element as experimental material, preliminarily studied the extracting and separating technology of Se-polysaccharides, the experiments studied the extracting technology by the methods of water extracting precipitation with alcohol, sevage deproteinizing, preciptation, drying and the content of polysaccharides and Se were determined by anthrone colorimetry and atomic absorption spectrometry. The optimum parameters to extract soluble Se-polysaccarides in Codonopsis pilosula were as follows: the extraction times is twice, the ration between material and solvent is 1: 20, the time is 2h, the temperature is 95℃. The content of soluble Se-polysaccarides is 5.5%, content of Se is 0.259%.

Key words:  , Codonopsis pilosula； selenium-polysaccharide； extraction； septraction；