Auricularia auricular polysaccharide(AAP) is a key bio-active material.It has the general biological properties,but it also has the function of adjusting immunity,bacteriostatic,anti-hepatitis,inhibiting mutation,anti-ulcer,reducing blood sugar,reducing cholesterol,promoting serum protein biosynthesis,etc..Farm raised black fungus in Guangxi Province was used as raw material.The composition of black fungus was measured by the gas chromatography.The water-soluble qualitative coarse polysaccharide was extracted by hot water and ethanol.Gas chromatography showed the composition of coarse polysaccharide was several monosaccharides including mannose,glucuronic acid,and galactose,xylose,glucose.