he homo-geneity astragalus membranceus polysaccharide was extracted and separeted by using the water as solvent, ethanol as precipitant. The molecular weight of polysaccharide was achieved by using sephadex G-75 gel analysis, and the distriluted diagram curve of the molecular lveight was got by the schulz-Dinlinger. The condition: centigrade was 20±0.02℃ dolvent was VH2O:Vactoen=69.93:30.07. was base on using spectropolarimetre. heterometric titration and the revised elias fomular with U-viscusim...