Abstract: Oligosaccharide was extracted from Stachys geobombycis with hot water and alcohol. The Stacgts geobombycis wasboiled at 80℃ for 2.5 h with liquid-to-solid ratio of 10:1 ml/g and the content of total polysaccharide in supernatant fluid could reach80% after filtration. Alcohol in different concentration was used to treat the filtrate liquor through a fractionated precipitationway to get the different oligosaccharide, which was then used to treat wheat to induce the resistance to wheat stripe rust.Results show that the alcohol in higher concentration could get the oligosaccharide, which is more helpful to induce the resis-tance of wheat to stripe rust.

Key words: oligosaccharide Stachys geobombycis, extract, wheat stripe rust diseasean