Abstract: The stems and leaves of medicinal economic plant Polygonatum sibiricum in Enshi city were used as test materials, and water was used as the extraction solvent to test the stems and leaves of Polygonatum sibiricum respectively, the optimized extraction process was obtained. The study found that when the ratio of material to liquid was 1∶20 （g∶mL）, the extraction time was 2 h and the temperature was 80 ℃, the yield of polysaccharide from Polygonatum sibiricum stems was 19.87%, the yield of polysaccharides from Polygonatum sibiricum leaf was 17.13%. The results show that the polysaccharide content in the stems of Polygonatum sibiricum are higher than that in leaves, but in general, the polysaccharide content in stems and leaves of Polygonatum sibiricum are still relatively high, and industrial production can be considered for further utilization.

Key words: Polygonatum sibiricum, polysaccharide, extraction process, orthogonal method