Three kinds of crude polysaccharides BP , BP , BP were extracted from Bulgaria inquinans by 75% ethanol, cool water, boiling water respectively. After ethanol grading, the crude polysaccharide BP was divided into three components BP a, BP b and BP c. Then the impurity in BPlIIb were eliminated by freezing and thawing repeatedly. Tested by SepharoseCL-4B Chromatogram, DEAE-Sephadex A-25 Chromatogram and electrophoresis, BP III b were proved to be homogeneous polysaccharide on molecular weigh...